Method and apparatus for deriving downlink pathloss for device-to-device transmit power control in a wireless communication system

ABSTRACT

A method and apparatus are disclosed from the perspective of a device to perform sidelink transmission. The method includes the device being in RRC (Radio Resource Control)-connected mode in Uu link. The method also includes the device being configured to use at least DL (Downlink) pathloss for sidelink power control. The method further includes the device deriving a first DL pathloss value for determining an uplink transmit power of one specific kind of uplink transmission. In addition, the method includes the device determining or deriving a sidelink transmit power based on the first DL pathloss value. Furthermore, the method includes the device performing a sidelink transmission to other device(s) with the sidelink transmit power.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present Application claims the benefit of U.S. Provisional PatentApplication Ser. No. 62/876,367 filed on Jul. 19, 2019, the entiredisclosure of which is incorporated herein in their entirety byreference.

FIELD

This disclosure generally relates to wireless communication networks,and more particularly, to a method and apparatus for deriving downlinkpathloss for device-to-device transmit power control in a wirelesscommunication system.

BACKGROUND

With the rapid rise in demand for communication of large amounts of datato and from mobile communication devices, traditional mobile voicecommunication networks are evolving into networks that communicate withInternet Protocol (IP) data packets. Such IP data packet communicationcan provide users of mobile communication devices with voice over IP,multimedia, multicast and on-demand communication services.

An exemplary network structure is an Evolved Universal Terrestrial RadioAccess Network (E-UTRAN). The E-UTRAN system can provide high datathroughput in order to realize the above-noted voice over IP andmultimedia services. A new radio technology for the next generation(e.g., 5G) is currently being discussed by the 3GPP standardsorganization. Accordingly, changes to the current body of 3GPP standardare currently being submitted and considered to evolve and finalize the3GPP standard.

SUMMARY

A method and apparatus are disclosed from the perspective of a device toperform sidelink transmission. The method includes the device being inRRC (Radio Resource Control)-connected mode in Uu link. The method alsoincludes the device being configured to use at least DL (Downlink)pathloss for sidelink power control. The method further includes thedevice deriving a first DL pathloss value for determining an uplinktransmit power of one specific kind of uplink transmission. In addition,the method includes the device determining or deriving a sidelinktransmit power based on the first DL pathloss value. Furthermore, themethod includes the device performing a sidelink transmission to otherdevice(s) with the sidelink transmit power.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a diagram of a wireless communication system according toone exemplary embodiment.

FIG. 2 is a block diagram of a transmitter system (also known as accessnetwork) and a receiver system (also known as user equipment or UE)according to one exemplary embodiment.

FIG. 3 is a functional block diagram of a communication system accordingto one exemplary embodiment.

FIG. 4 is a functional block diagram of the program code of FIG. 3according to one exemplary embodiment.

FIGS. 5A-5C provide exemplary illustrations of three types ofbeamforming.

FIG. 6 is a reproduction of FIG. 1 of 3GPP R2-162709.

FIG. 7 is a reproduction of Table 14.2-2 of 3GPP TS 36.213 V15.6.0.

FIG. 8 is a table summarizing alternatives applied for NR uplinktransmissions according to one exemplary embodiment.

FIG. 9 is a diagram according to one exemplary embodiment.

FIG. 10 is a diagram according to one exemplary embodiment.

FIG. 11 is a diagram according to one exemplary embodiment.

FIG. 12 is a diagram according to one exemplary embodiment.

FIG. 13 is a diagram according to one exemplary embodiment.

FIG. 14 is a diagram according to one exemplary embodiment.

FIG. 15 is a table summarizing alternatives for deriving DL pathlossvalue for determining or deriving sidelink transmit power according toone exemplary embodiment.

FIG. 16 a flow chart according to one exemplary embodiment.

FIG. 17 is a flow chart according to one exemplary embodiment.

FIG. 18 is a flow chart according to one exemplary embodiment.

DETAILED DESCRIPTION

The exemplary wireless communication systems and devices described belowemploy a wireless communication system, supporting a broadcast service.Wireless communication systems are widely deployed to provide varioustypes of communication such as voice, data, and so on. These systems maybe based on code division multiple access (CDMA), time division multipleaccess (TDMA), orthogonal frequency division multiple access (OFDMA),3GPP LTE (Long Term Evolution) wireless access, 3GPP LTE-A orLTE-Advanced (Long Term Evolution Advanced), 3GPP2 UMB (Ultra MobileBroadband), WiMax, 3GPP NR (New Radio), or some other modulationtechniques.

In particular, the exemplary wireless communication systems devicesdescribed below may be designed to support one or more standards such asthe standard offered by a consortium named “3rd Generation PartnershipProject” referred to herein as 3GPP, including: R2-162366, “Beam FormingImpacts”, Nokia, Alcatel-Lucent; R2-163716, “Discussion on terminologyof beamforming based high frequency NR”, Samsung; R2-162709, “Beamsupport in NR”, Intel; R2-162762, “Active Mode Mobility in NR: SINRdrops in higher frequencies”, Ericsson; TS 36.213 V15.6.0 (2019-06),“E-UTRA; Physical layer procedures (Release 15)”; TS 36.214 V15.3.0(2018-09), “E-UTRA; Physical layer; Measurements (Release 15)”;R1-1810051, “Final Report of 3GPP TSG RAN WG1 #94 v1.0.0 (Gothenburg,Sweden, 20-24 Aug. 2018)”; R1-1812101, “Final Report of 3GPP TSG RAN WG1#94bis v1.0.0 (Chengdu, China, 8-12 Oct. 2018)”; R1-1901482, “FinalReport of 3GPP TSG RAN WG1 #95 v0.1.0 (Spokane, USA, 12-16 Nov. 2018)”;R1-1901483, “Final Report of 3GPP TSG RAN WG1 #AH_1901 v1.0.0 (Taipei,Taiwan, 21-25 Jan. 2019)”; R1-1905837, “Final Report of 3GPP TSG RAN WG1#96 v2.0.0 (Athens, Greece, 25 Feb.-1 Mar. 2019)”; R1-1905921, “FinalReport of 3GPP TSG RAN WG1 #96bis v1.0.0 (Xi'an, China, 8-12 Apr.2019)”; Draft Report of 3GPP TSG RAN WG1 #97 v0.1.0 (Reno, USA, 13-17May 2019); and R1-1907682, “Feature lead summary for agenda item 7.2.4.5Physical layer procedures for sidelink”, LG Electronics. The standardsand documents listed above are hereby expressly incorporated byreference in their entirety.

FIG. 1 shows a multiple access wireless communication system accordingto one embodiment of the invention. An access network 100 (AN) includesmultiple antenna groups, one including 104 and 106, another including108 and 110, and an additional including 112 and 114. In FIG. 1, onlytwo antennas are shown for each antenna group, however, more or fewerantennas may be utilized for each antenna group. Access terminal 116(AT) is in communication with antennas 112 and 114, where antennas 112and 114 transmit information to access terminal 116 over forward link120 and receive information from access terminal 116 over reverse link118. Access terminal (AT) 122 is in communication with antennas 106 and108, where antennas 106 and 108 transmit information to access terminal(AT) 122 over forward link 126 and receive information from accessterminal (AT) 122 over reverse link 124. In a FDD system, communicationlinks 118, 120, 124 and 126 may use different frequency forcommunication. For example, forward link 120 may use a differentfrequency then that used by reverse link 118.

Each group of antennas and/or the area in which they are designed tocommunicate is often referred to as a sector of the access network. Inthe embodiment, antenna groups each are designed to communicate toaccess terminals in a sector of the areas covered by access network 100.

In communication over forward links 120 and 126, the transmittingantennas of access network 100 may utilize beamforming in order toimprove the signal-to-noise ratio of forward links for the differentaccess terminals 116 and 122. Also, an access network using beamformingto transmit to access terminals scattered randomly through its coveragecauses less interference to access terminals in neighboring cells thanan access network transmitting through a single antenna to all itsaccess terminals.

An access network (AN) may be a fixed station or base station used forcommunicating with the terminals and may also be referred to as anaccess point, a Node B, a base station, an enhanced base station, anevolved Node B (eNB), or some other terminology. An access terminal (AT)may also be called user equipment (UE), a wireless communication device,terminal, access terminal or some other terminology.

FIG. 2 is a simplified block diagram of an embodiment of a transmittersystem 210 (also known as the access network) and a receiver system 250(also known as access terminal (AT) or user equipment (UE)) in a MIMOsystem 200. At the transmitter system 210, traffic data for a number ofdata streams is provided from a data source 212 to a transmit (TX) dataprocessor 214.

In one embodiment, each data stream is transmitted over a respectivetransmit antenna. TX data processor 214 formats, codes, and interleavesthe traffic data for each data stream based on a particular codingscheme selected for that data stream to provide coded data.

The coded data for each data stream may be multiplexed with pilot datausing OFDM techniques. The pilot data is typically a known data patternthat is processed in a known manner and may be used at the receiversystem to estimate the channel response. The multiplexed pilot and codeddata for each data stream is then modulated (i.e., symbol mapped) basedon a particular modulation scheme (e.g., BPSK, QPSK, M-PSK, or M-QAM)selected for that data stream to provide modulation symbols. The datarate, coding, and modulation for each data stream may be determined byinstructions performed by processor 230.

The modulation symbols for all data streams are then provided to a TXMIMO processor 220, which may further process the modulation symbols(e.g., for OFDM). TX MIMO processor 220 then provides N_(T) modulationsymbol streams to N_(T) transmitters (TMTR) 222 a through 222 t. Incertain embodiments, TX MIMO processor 220 applies beamforming weightsto the symbols of the data streams and to the antenna from which thesymbol is being transmitted.

Each transmitter 222 receives and processes a respective symbol streamto provide one or more analog signals, and further conditions (e.g.,amplifies, filters, and upconverts) the analog signals to provide amodulated signal suitable for transmission over the MIMO channel. N_(T)modulated signals from transmitters 222 a through 222 t are thentransmitted from N_(T) antennas 224 a through 224 t, respectively.

At receiver system 250, the transmitted modulated signals are receivedby N_(R) antennas 252 a through 252 r and the received signal from eachantenna 252 is provided to a respective receiver (RCVR) 254 a through254 r. Each receiver 254 conditions (e.g., filters, amplifies, anddownconverts) a respective received signal, digitizes the conditionedsignal to provide samples, and further processes the samples to providea corresponding “received” symbol stream.

An RX data processor 260 then receives and processes the N_(R) receivedsymbol streams from N_(R) receivers 254 based on a particular receiverprocessing technique to provide N_(T) “detected” symbol streams. The RXdata processor 260 then demodulates, deinterleaves, and decodes eachdetected symbol stream to recover the traffic data for the data stream.The processing by RX data processor 260 is complementary to thatperformed by TX MIMO processor 220 and TX data processor 214 attransmitter system 210.

A processor 270 periodically determines which pre-coding matrix to use(discussed below). Processor 270 formulates a reverse link messagecomprising a matrix index portion and a rank value portion.

The reverse link message may comprise various types of informationregarding the communication link and/or the received data stream. Thereverse link message is then processed by a TX data processor 238, whichalso receives traffic data for a number of data streams from a datasource 236, modulated by a modulator 280, conditioned by transmitters254 a through 254 r, and transmitted back to transmitter system 210.

At transmitter system 210, the modulated signals from receiver system250 are received by antennas 224, conditioned by receivers 222,demodulated by a demodulator 240, and processed by a RX data processor242 to extract the reserve link message transmitted by the receiversystem 250. Processor 230 then determines which pre-coding matrix to usefor determining the beamforming weights then processes the extractedmessage.

Turning to FIG. 3, this figure shows an alternative simplifiedfunctional block diagram of a communication device according to oneembodiment of the invention. As shown in FIG. 3, the communicationdevice 300 in a wireless communication system can be utilized forrealizing the UEs (or ATs) 116 and 122 in FIG. 1 or the base station (orAN) 100 in FIG. 1, and the wireless communications system is preferablythe NR system. The communication device 300 may include an input device302, an output device 304, a control circuit 306, a central processingunit (CPU) 308, a memory 310, a program code 312, and a transceiver 314.The control circuit 306 executes the program code 312 in the memory 310through the CPU 308, thereby controlling an operation of thecommunications device 300. The communications device 300 can receivesignals input by a user through the input device 302, such as a keyboardor keypad, and can output images and sounds through the output device304, such as a monitor or speakers. The transceiver 314 is used toreceive and transmit wireless signals, delivering received signals tothe control circuit 306, and outputting signals generated by the controlcircuit 306 wirelessly. The communication device 300 in a wirelesscommunication system can also be utilized for realizing the AN 100 inFIG. 1.

FIG. 4 is a simplified block diagram of the program code 312 shown inFIG. 3 in accordance with one embodiment of the invention. In thisembodiment, the program code 312 includes an application layer 400, aLayer 3 portion 402, and a Layer 2 portion 404, and is coupled to aLayer 1 portion 406. The Layer 3 portion 402 generally performs radioresource control. The Layer 2 portion 404 generally performs linkcontrol. The Layer 1 portion 406 generally performs physicalconnections.

As described in 3GPP R2-162366, in lower frequency bands (e.g. currentLTE bands<6 GHz) the required cell coverage may be provided by forming awide sector beam for transmitting downlink common channels. However,utilizing wide sector beam on higher frequencies (>>6 GHz) the cellcoverage is reduced with same antenna gain. Thus, in order to providerequired cell coverage on higher frequency bands, higher antenna gain isneeded to compensate the increased path loss. To increase the antennagain over a wide sector beam, larger antenna arrays (number of antennaelements ranging from tens to hundreds) are used to form high gainbeams.

As a consequence the high gain beams are narrow compared to a widesector beam so multiple beams for transmitting downlink common channelsare needed to cover the required cell area. The number of concurrenthigh gain beams that access point is able to form may be limited by thecost and complexity of the utilized transceiver architecture. Inpractice, on higher frequencies, the number of concurrent high gainbeams is much less than the total number of beams required to cover thecell area. In other words, the access point is able to cover only partof the cell area by using a subset of beams at any given time.

As described in 3GPP R2-163716, beamforming (for example, FIGS. 5A-5Cillustrate three types of beamforming) is a signal processing techniqueused in antenna arrays for directional signal transmission or reception.With beamforming, a beam can be formed by combining elements in a phasedarray of antennas in such a way that signals at particular anglesexperience constructive interference while others experience destructiveinterference. Different beams can be utilized simultaneously usingmultiple arrays of antennas.

As discussed in 3GPP R2-162709 and as shown in FIG. 6 (which illustratesbeam concept in 5G), an eNB may have multiple TRPs (either centralizedor distributed). Each TRP can form multiple beams. The number of beamsand the number of simultaneous beams in the time or frequency domaindepend on the number of antenna array elements and the RF (RadioFrequency) at the TRP.

Potential mobility type for NR (New Radio) can be listed:

-   -   Intra-TRP mobility    -   Inter-TRP mobility    -   Inter-NR eNB mobility

In 3GPP R2-162762, reliability of a system purely relying on beamformingand operating in higher frequencies might be challenging, since thecoverage might be more sensitive to both time and space variations. As aconsequence of that the SINR (Signal to Interference and Noise Ratio) ofthat narrow link can drop much quicker than in the case of LTE.

Using antenna arrays at access nodes with the number of elements in thehundreds, fairly regular grid-of-beams coverage patterns with tens orhundreds of candidate beams per node may be created. The coverage areaof an individual beam from such array may be small, down to the order ofsome tens of meters in width. As a consequence, channel qualitydegradation outside the current serving beam area is quicker than in thecase of wide area coverage, as provided by LTE.

3GPP TS 36.213 specifies the UE procedure for LTE V2X transmission. TheV2X transmissions are performed as sidelink transmission mode 3 orsidelink transmission mode 4.

5.1.1.1 UE Behaviour

[ . . . ]

-   -   PL_(c) is the downlink path loss estimate calculated in the UE        for serving cell c in dB and PL_(c)=referenceSignalPower−higher        layer filtered RSRP, where referenceSignalPower is provided by        higher layers and RSRP is defined in [5] for the reference        serving cell and the higher layer filter configuration is        defined in [11] for the reference serving cell.        -   If serving cell c belongs to a TAG containing the primary            cell then, for the uplink of the primary cell, the primary            cell is used as the reference serving cell for determining            referenceSignalPower and higher layer filtered RSRP. For the            uplink of the secondary cell, the serving cell configured by            the higher layer parameter pathlossReferenceLinking defined            in [11] is used as the reference serving cell for            determining referenceSignalPower and higher layer filtered            RSRP.        -   If serving cell c belongs to a TAG containing the PSCell            then, for the uplink of the PSCell, the PSCell is used as            the reference serving cell for determining            referenceSignalPower and higher layer filtered RSRP; for the            uplink of the secondary cell other than PSCell, the serving            cell configured by the higher layer parameter            pathlossReferenceLinking defined in [11] is used as the            reference serving cell for determining referenceSignalPower            and higher layer filtered RSRP.        -   If serving cell c belongs to a TAG not containing the            primary cell or PSCell then serving cell c is used as the            reference serving cell for determining referenceSignalPower            and higher layer filtered RSRP.            [ . . . ]

14 UE Procedures Related to Sidelink

[ . . . ]

14.1 Physical Sidelink Shared Channel Related Procedures

14.1.1 UE Procedure for Transmitting the PSSCH

[ . . . ]

14.1.1.5 UE Procedure for PSSCH Power Control

[ . . . ]

For sidelink transmission mode 3, the UE transmit power P_(PSSCH) forPSSCH transmission is given by

${P_{PSSCH} = {{10{\log_{10}\left( \frac{M_{PSSCH}}{M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + {\min{\left\{ {P_{CMAX},{{10{\log_{10}\left( {M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + P_{{O_{-}{PSSCH}},3} + {\alpha_{{PSSCH},3} \cdot {PL}}}} \right\}\left\lbrack {{dB}\; m} \right\rbrack}}}},$where P_(CMAX) is defined in [6], and M_(PSSCH) is the bandwidth of thePSSCH resource assignment expressed in number of resource blocks andPL=PL_(c) where PL_(c) is defined in Subclause 5.1.1.1. P_(O_PSSCH,3)and α_(PSSCH,3) are provided by higher layer parameters pOSL-V2V andalphaSL-V2V, respectively and that are associated with the correspondingPSSCH resource configuration. For sidelink transmission mode 4, the UEtransmit power P_(PSSCH) for PSSCH transmission in subframe n is givenby

${P_{PSSCH} = {{10{\log_{10}\left( \frac{M_{PSSCH}}{M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + {A\left\lbrack {{dB}\; m} \right\rbrack}}},$where P_(CMAX) is defined in [6], M_(PSSCH) is the bandwidth of thePSSCH resource assignment expressed in number of resource blocks,M_(PSCCH)=2, and PL=PL_(c) where PL_(c) is defined in Subclause 5.1.1.1.P_(O_PSSCH,4) and α_(PSSCH,4) are provided by higher layer parameterspOSL-V2V and alphaSL-V2V, respectively and that are associated with thecorresponding PSSCH resource configuration. If higher layer parametermaxTxpower is configured then

$A = {\min\left\{ {P_{CMAX},P_{{MAX}_{-}{CBR}},\ {{10{\log_{10}\left( {M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + P_{{O_{-}{PSSCH}},4} + {\alpha_{{PSSCH},4} \cdot {PL}}}} \right\}}$else

$A = {\min\left\{ {P_{CMAX},\ {{10{\log_{10}\left( {M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + P_{{O_{-}{PSSCH}},4} + {\alpha_{{PSSCH},4} \cdot {PL}}}} \right\}}$where P_(MAX_CBR) is set to a maxTxpower value based on the prioritylevel of the PSSCH and the CBR range which includes the CBR measured insubframe n−4.

14.1.1.6 UE Procedure for Determining the Subset of Resources to beReported to Higher Layers in PSSCH Resource Selection in SidelinkTransmission Mode 4 and in Sensing Measurement in Sidelink TransmissionMode 3

In sidelink transmission mode 4, when requested by higher layers insubframe n for a carrier, the UE shall determine the set of resources tobe reported to higher layers for PSSCH transmission according to thesteps described in this Subclause. Parameters L_(subCH) the number ofsub-channels to be used for the PSSCH transmission in a subframe,P_(rsvp_TX) the resource reservation interval, and prio_(TX) thepriority to be transmitted in the associated SCI format 1 by the UE areall provided by higher layers (described in [8]). C_(resel) isdetermined according to Subclause 14.1.1.4B.

In sidelink transmission mode 3, when requested by higher layers insubframe n for a carrier, the UE shall determine the set of resources tobe reported to higher layers in sensing measurement according to thesteps described in this Subclause. Parameters L_(subCH), P_(rsvp_TX) andprio_(TX) are all provided by higher layers (described in [11]).C_(resel) is determined by C_(resel)=10*SL_RESOURCE_RESELECTION_COUNTER,where SL_RESOURCE_RESELECTION_COUNTER is provided by higher layers [11].

If partial sensing is not configured by higher layers then the followingsteps are used:

-   -   1) A candidate single-subframe resource for PSSCH transmission        R_(x,y) is defined as a set of L_(subCH) contiguous sub-channels        with sub-channel x+j in subframe t_(y) ^(SL) where j=0, . . . ,        L_(subCH)−1. The UE shall assume that any set of L_(subCH)        contiguous sub-channels included in the corresponding PSSCH        resource pool (described in 14.1.5) within the time interval        [n+T₁, n+T₂] corresponds to one candidate single-subframe        resource, where selections of T₁ and T₂ are up to UE        implementations under T₁≤4 and T_(2min)(prio_(TX))≤T₂≤100, if        T_(2 min)(prio_(TX)) is provided by higher layers for prio_(TX),        otherwise 20≤T₂≤100. UE selection of T₂ shall fulfil the latency        requirement. The total number of the candidate single-subframe        resources is denoted by M_(total).    -   2) The UE shall monitor subframes t_(n′−10×P) _(step) ^(SL),        t_(n′−10×P) _(step) ₊₁ ^(SL), . . . , t_(n′−1) ^(SL) except for        those in which its transmissions occur, where t_(n′) ^(SL)=n if        subframe n belongs to the set (t₀ ^(SL), t₁ ^(SL), . . . , t_(T)        _(max) ^(SL)), otherwise subframe t_(n′) ^(SL) is the first        subframe after subframe n belonging to the set (t₀ ^(SL), t₁        ^(SL), . . . , t_(T) _(max) ^(SL)). The UE shall perform the        behaviour in the following steps based on PSCCH decoded and        S-RSSI measured in these subframes.    -   3) The parameter Th_(a,b) is set to the value indicated by the        i-th SL-ThresPSSCH-RSRP field in SL-ThresPSSCH-RSRP-List where        i=a* 8+b+1.    -   4) The set S_(A) is initialized to the union of all the        candidate single-subframe resources. The set S_(B) is        initialized to an empty set.    -   5) The UE shall exclude any candidate single-subframe resource        R_(x,y) from the set S_(A) if it meets all the following        conditions:        -   the UE has not monitored subframe t_(z) ^(SL) in Step 2.        -   there is an integer j which meets            y+j×P′_(rsvp_TX)=z+P_(step)×k×q where j=0, 1, . . . ,            C_(resel)−1, P′_(rsvp_TX)=P_(step)×P_(RSVP_TX)/100, k is any            value allowed by the higher layer parameter            restrictResourceReservationPeriod and q=1,2, . . . , Q.            Here, Q=1/k if k<1 and n′−z≤P_(step)×k, where t_(n′) ^(SL)=n            if subframe n belongs to the set t₀ ^(SL), t₁ ^(SL), . . . ,            t_(T) _(max) t^(SL), otherwise subframe t_(n′) ^(SL) is the            first subframe belonging to the set t₀ ^(SL), t₁ ^(SL), . .            . , t_(T) _(max) ^(SL) after subframe n; and Q=1 otherwise.    -   6) The UE shall exclude any candidate single-subframe resource        R_(x,y) from the set S_(A) if it meets all the following        conditions:        -   the UE receives an SCI format 1 in subframe t_(m) ^(SL), and            “Resource reservation” field and “Priority” field in the            received SCI format 1 indicate the values P_(rsvp_RX) and            prio_(RX), respectively according to Subclause 14.2.1.        -   PSSCH-RSRP measurement according to the received SCI format            1 is higher than Th_(prio) _(TX) _(, prio) _(RX) .        -   the SCI format received in subframe t_(m) ^(SL) or the same            SCI format 1 which is assumed to be received in subframe(s)            t_(m−q×P) _(step) _(×P) _(rsvp_RX) ^(SL) determines            according to 14.1.1.4C the set of resource blocks and            subframes which overlaps with R_(x,y+j×P′) _(rsvp_TX) for            q=1, 2, . . . , Q and j=0, 1, . . . , C_(resel)−1. Here,

${Q = {{\frac{1}{P_{{rsvp}_{-}{RX}}}\mspace{14mu}{if}\mspace{14mu} P_{{rsvp}_{-}{RX}}} < {{1\mspace{14mu}{and}\mspace{14mu} n^{\prime}} - m} \leq {P_{step} \times P_{{rsvp}_{-}{RX}}}}},$where t_(n′) ^(SL)=n if subframe n belongs to the set (t₀ ^(SL), t₁^(SL), . . . , t_(T) _(max) ^(SL)), otherwise subframe t_(n′) ^(SL) isthe first subframe after subframe n belonging to the set (t₀ ^(SL), t₁^(SL), . . . , t_(T) _(max) ^(SL)); otherwise Q=1.

-   -   7) If the number of candidate single-subframe resources        remaining in the set S_(A) is smaller than 0.2·M_(total), then        Step 4 is repeated with Th_(a,b) increased by 3 dB.    -   8) For a candidate single-subframe resource R_(x,y) remaining in        the set S_(A), the metric E_(x,y) is defined as the linear        average of S-RSSI measured in sub-channels x+k for k=0, . . . ,        L_(subCH)−1 in the monitored subframes in Step 2 that can be        expressed by t_(y−P) _(step) _(*j) ^(SL) for a non-negative        integer j if P_(rsvp_TX)≥100, and t_(y−P′) _(rsvp_TX) _(*j)        ^(SL) for a non-negative integer j otherwise.    -   9) The UE moves the candidate single-subframe resource R_(x,y)        with the smallest metric E_(x,y) from the set S_(A) to S_(B).        This step is repeated until the number of candidate        single-subframe resources in the set S_(B) becomes greater than        or equal to 0.2·M_(total),    -   10) When the UE is configured by upper layers to transmit using        resource pools on multiple carriers, it shall exclude a        candidate single-subframe resource R_(x,y) from S_(B) if the UE        does not support transmission in the candidate single-subframe        resource in the carrier under the assumption that transmissions        take place in other carrier(s) using the already selected        resources due to its limitation in the number of simultaneous        transmission carriers, its limitation in the supported carrier        combinations, or interruption for RF retuning time [10].

The UE shall report set S_(B) to higher layers.

[. . . ]

14.2 Physical Sidelink Control Channel Related Procedures

For sidelink transmission mode 3, if a UE is configured by higher layersto receive DCI format 5A with the CRC scrambled by the SL-V-RNTI orSL-SPS-V-RNTI, the UE shall decode the PDCCH/EPDCCH according to thecombination defined in Table 14.2-2. A UE is not expected to receive DCIformat 5A with size larger than DCI format 0 in the same search spacethat DCI format 0 is defined on.

-   [Table 14.2-2 of 3GPP TS 36.213 V15.6.0, entitled “PDCCH/EPDCCH    configured by SL-V-RNTI or SL-SPS-V-RNTI” is reproduced as FIG. 7]

The carrier indicator field value in DCI format 5A corresponds tov2x-InterFreqInfo.

14.2.1 UE Procedure for Transmitting the PSCCH

[. . . ]

14.2.1.3 UE Procedure for PSCCH Power Control

[ . . . ] For sidelink transmission mode 3, the UE transmit powerP_(PSCCH) for PSCCH transmission is given by

${P_{PSSCH} = {{10{\log_{10}\left( \frac{10^{\frac{3}{10}} \times M_{PSCCH}}{M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + {\min{\left\{ {P_{CMAX},{{10{\log_{10}\left( {M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + P_{{O_{-}{PSSCH}},3} + {\alpha_{{PSSCH},3} \cdot {PL}}}} \right\}\left\lbrack {{dB}\; m} \right\rbrack}}}},$where P_(CMA:) is defined in [6], M_(PSSCI) is the bandwidth of thePSSCH resource assignment expressed in number of resource block,M_(PSCCH)=2 and PL=PL_(c) where PL_(c) is defined in Subclause 5.1.1.1.P_(O_PSSCH:) and α_(PSSCH,3) are provided by higher layer parameterspOSL-V2V and alphaSL-V2V, respectively and that are associated with thecorresponding PSSCH resource configuration.

For sidelink transmission mode 4, the UE transmit power P_(PSCCH) forPSCCH transmission in subframe n is given by

${P_{PSCCH} = {{10{\log_{10}\left( \frac{10^{\frac{3}{10}} \times M_{PSCCH}}{M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + {B\left\lbrack {{dB}\; m} \right\rbrack}}},$where P_(CMA) is defined in [6], M_(PSSCI) is the bandwidth of the PSSCHresource assignment expressed in number of resource block, M_(PSCCH)=2,and PL=PL_(c) where PL_(c) is defined in Subclause 5.1.1.1. P_(O_PSSCH),and α_(PSSCH,4) are provided by higher layer parameters pOSL-V2V andalphaSL-V2V, respectively and that are associated with the correspondingPSSCH resource configuration. If higher layer parameter maxTxpower isconfigured then

$B = {\min\left\{ {P_{CMAX},P_{{MAX}_{-}{CBR}},\ {{10{\log_{10}\left( {M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + P_{{O_{-}{PSSCH}},4} + {\alpha_{{PSSCH},4} \cdot {PL}}}} \right\}}$else

$B = {\min\left\{ {P_{CMAX},\ {{10{\log_{10}\left( {M_{PSSCH} + {10^{\frac{3}{10}} \times M_{PSCCH}}} \right)}} + P_{{O_{-}{PSSCH}},4} + {\alpha_{{PSSCH},4} \cdot {PL}}}} \right\}}$where P_(MAX_CBR) is set to a maxTxpower value based on the prioritylevel of the PSSCH and the CBR range which includes the CBR measured insubframe n−4.

3GPP TS 36.214 specifies some measurements for sidelink transmission.

5.1.28 Sidelink Received Signal Strength Indicator (S-RSSI) DefinitionSidelink RSSI (S-RSSI) is defined as the linear average of the totalreceived power (in [W]) per SC-FDMA symbol observed by the UE only inthe configured sub-channel in SC-FDMA symbols 1, 2, . . . , 6 of thefirst slot and SC-FDMA symbols 0, 1, . . . , 5 of the second slot of asubframe The reference point for the S-RSSI shall be the antennaconnector of the UE. If receiver diversity is in use by the UE, thereported value shall not be lower than the corresponding S-RSSI of anyof the individual diversity branches Applicable RRC_IDLEintra-frequency, for RRC_IDLE inter-frequency, RRC_CONNECTEDintra-frequency, RRC_CONNECTED inter-frequency

5.1.29 PSSCH Reference Signal Received Power (PSSCH-RSRP) DefinitionPSSCH Reference Signal Received Power (PSSCH-RSRP) is defined as thelinear average over the power contributions (in [W]) of the resourceelements that carry demodulation reference signals associated withPSSCH, within the PRBs indicated by the associated PSCCH. The referencepoint for the PSSCH-RSRP shall be the antenna connector of the UE. Ifreceiver diversity is in use by the UE, the reported value shall not belower than the corresponding PSSCH-RSRP of any of the individualdiversity branches Applicable RRC_IDLE intra-frequency, for RRC_IDLEinter-frequency, RRC_CONNECTED intra-frequency, RRC_CONNECTEDinter-frequency NOTE: The power per resource element is determined fromthe energy received during the useful part of the symbol, excluding theCP.

3GPP TS 36.212 specifies CRC attachment for downlink shared channel anddownlink control information. The downlink shared channel and downlinkcontrol information are for communication between network node and UE,i.e. Uu link.

5.3.3 Downlink Control Information

A DCI transports downlink, uplink or sidelink scheduling information,requests for aperiodic CQI reports, LAA common information,notifications of MCCH change [6] or uplink power control commands forone cell and one RNTI. The RNTI is implicitly encoded in the CRC.

FIG. 5.3.3-1 shows the processing structure for one DCI. The followingcoding steps can be identified:

-   -   Information element multiplexing    -   CRC attachment    -   Channel coding    -   Rate matching

The coding steps for DCI are shown in the figure below.

[ . . . ]

5.3.3.1.9A Format 5A

DCI format 5A is used for the scheduling of PSCCH, and also containsseveral SCI format 1 fields used for the scheduling of PSSCH.

The following information is transmitted by means of the DCI format 5A:

-   -   Carrier indicator—3 bits. This field is present according to the        definitions in [3].    -   Lowest index of the subchannel allocation to the initial        transmission—┌log₂(N_(subchannel) ^(SL))┐ bits as defined in        subclause 14.1.1.4C of [3].    -   SCI format 1 fields according to 5.4.3.1.2:        -   Frequency resource location of initial transmission and            retransmission.        -   Time gap between initial transmission and retransmission.    -   SL index—2 bits as defined in subclause 14.2.1 of [3] (this        field is present only for cases with TDD operation with        uplink-downlink configuration 0-6).

When the format 5A CRC is scrambled with SL-SPS-V-RNTI, the followingfields are present:

-   -   SL SPS configuration index—3 bits as defined in subclause 14.2.1        of [3].    -   Activation/release indication—1 bit as defined in subclause        14.2.1 of [3].

3GPP TS 36.212 also specifies CRC attachment for sidelink shared channeland sidelink control information. The sidelink shared channel andsidelink control information are for communication between devices, i.e.PC5 link or device-to-device link.

5.4 Sidelink Transport Channels and Control Information

[ . . . ]

5.4.2 Sidelink Shared Channel

The processing of the sidelink shared channel follows the downlinkshared channel according to subclause 5.3.2, with the followingdifferences:

-   -   Data arrives to the coding unit in the form of a maximum of one        transport block every transmission time interval (TTI)    -   In the step of code block concatenation, the sequence of coded        bits corresponding to one transport block after code block        concatenation is referred to as one codeword in subclause 9.3.1        of [2].    -   PUSCH interleaving is applied according to subclauses 5.2.2.7        and 5.2.2.8 without any control information in order to apply a        time-first rather than frequency-first mapping, where c_(max)=2        (N_(symb) ^(SL)−1). For SL-SCH configured by higher layers for        V2X sidelink, C_(max)=2·(N_(symb) ^(SL)−2)−1 is used if the        transmission format field of SCI format 1 is present and set to        1, otherwise C_(max)=2·(N_(symb) ^(SL)−2).

5.4.3 Sidelink Control Information

An SCI transports sidelink scheduling information.

The processing for one SCI follows the downlink control informationaccording to subclause 5.3.3, with the following differences:

-   -   In the step of CRC attachment, no scrambling is performed.    -   PUSCH interleaving is applied according to subclauses 5.2.2.7        and 5.2.2.8 without any control information in order to apply a        time-first rather than frequency-first mapping, where        C_(max)=2·(N_(symb) ^(SL)−1) and the sequence of bits f is equal        to e. For SCI format 1, C_(max)=2·(N_(symb) ^(SL)−2)

5.4.3.1 SCI Formats

The fields defined in the SCI formats below are mapped to theinformation bits α₀ to α_(A-1) as follows.

[ . . . ]

5.4.3.1.2 SCI Format 1

SCI format 1 is used for the scheduling of PSSCH.

The following information is transmitted by means of the SCI format 1:

-   -   Priority—3 bits as defined in subclause 4.4.5.1 of [7].    -   Resource reservation—4 bits as defined in subclause 14.2.1 of        [3].    -   Frequency resource location of initial transmission and        retransmission—┌log₂ (N_(subchannel) ^(SL) (N_(subchannel)        ^(SL)+1)/2)┐ bits as defined in subclause 14.1.1.4C of [3].    -   Time gap between initial transmission and retransmission—4 bits        as defined in subclause 14.1.1.4C of [3].    -   Modulation and coding scheme—5 bits as defined in subclause        14.2.1 of [3].    -   Retransmission index—1 bit as defined in subclause 14.2.1 of        [3].    -   Transmission format—1 bit, where value 1 indicates a        transmission format including rate-matching and TBS scaling, and        value 0 indicates a transmission format including puncturing and        no TBS-scaling. This field is only present if the transport        mechanism selected by higher layers indicates the support of        rate matching and TBS scaling.    -   Reserved information bits are added until the size of SCI format        1 is equal to 32 bits. The reserved bits are set to zero.

3GPP TS 38.213 specifies uplink power control for setting PUSCH(Physical Uplink Shared Channel), PUCCH (Physical Uplink ControlChannel), and SRS (Sound Reference Signal) transmit power.

7 Uplink Power Control

Uplink power control determines a power for PUSCH, PUCCH, SRS, and PRACHtransmissions.

A UE does not expect to simultaneously maintain more than four pathlossestimates per serving cell for all PUSCH/PUCCH/SRS transmissions asdescribed in Subclauses 7.1.1, 7.2.1, and 7.3.1.

A PUSCH/PUCCH/SRS/PRACH transmission occasion i is defined by a slotindex n_(s,f) ^(u) within a frame with system frame number SFN, a firstsymbol S within the slot, and a number of consecutive symbols L.

7.1 Physical Uplink Shared Channel

For a PUSCH transmission on active UL BWP b, as described in Subclause12, of carrier f of serving cell c, a UE first calculates a linear value{circumflex over (P)}_(PUSCH,b,f,c)(i,j,q_(d),l) of the transmit powerP_(PUSCH,b,f,c)(i,j,q_(d),l), with parameters as defined in Subclause7.1.1. [ . . . ]

7.1.1 UE Behaviour

If a UE transmits a PUSCH on active UL BWP b of carrier f of servingcell c using parameter set configuration with index j and PUSCH powercontrol adjustment state with index l, the UE determines the PUSCHtransmission power P_(PUSCH,b,f,c)(i,j,q_(d),l) in PUSCH transmissionoccasion i as

${P_{{PUSCH},b,f,c}\left( {i,j,q_{d},l} \right)} = {\min{\begin{Bmatrix}{{P_{{CMAX},f,c}(i)},} \\{{P_{{O\_ PUSCH},b,f,c}(j)} + {10\;\log_{10}}} \\{\left( {2^{\mu} \cdot {M_{{RB},b,f,c}^{PUSCH}(i)}} \right) +} \\{{{\alpha_{b,f,c}(j)} \cdot {{PL}_{b,f,c}\left( q_{d} \right)}} +} \\{{\Delta_{{TF},b,f,c}(i)} + {f_{b,f,c}\left( {i,l} \right)}}\end{Bmatrix}\left\lbrack {{dB}\; m} \right\rbrack}}$where,

-   -   P_(CMAX,f,c)(i) is the UE configured maximum output power        defined in [8-1, TS 38.101-1], [8-2, TS38.101-2] and [8-3,        TS38.101-3] for carrier f of serving cell c in PUSCH        transmission occasion i.    -   P_(O_PUSCH,f,c)(i) is a parameter composed of the sum of a        component P_(O_NOMINAL_PUSCH,f,c)(i) and a component        P_(O_UE_PUSCH,b,f,c)(j) where j∈{0, 1, . . . , J−1}.        [ . . . ]    -   For α_(b,f,c)(j)        [ . . . ]    -   M_(RB,b,f,c) ^(PUSCH)(i) is the bandwidth of the PUSCH resource        assignment expressed in number of resource blocks for PUSCH        transmission occasion i on active UL BWP b of carrier f of        serving cell c and μ is a SCS configuration defined in [4, TS        38.211]    -   PL_(b,f,c)(q_(d)) is a downlink pathloss estimate in dB        calculated by the UE using reference signal (RS) index q_(d) for        the active DL BWP, as described in Subclause 12, of carrier f of        serving cell c        -   If the UE is not provided PUSCH-PathlossReferenceRS or            before the UE is provided dedicated higher layer parameters,            the UE calculates PL_(b,f,c)(q_(d)) using a RS resource from            the SS/PBCH block that the UE uses to obtain MIB        -   If the UE is configured with a number of RS resource            indexes, up to the value of            maxNrofPUSCH-PathlossReferenceRSs, and a respective set of            RS configurations for the number of RS resource indexes by            PUSCH-PathlossReferenceRS, the set of RS resource indexes            can include one or both of a set of SS/PBCH block indexes,            each provided by ssb-Index when a value of a corresponding            pusch-PathlossReferenceRS-Id maps to a SS/PBCH block index,            and a set of CSI-RS resource indexes, each provided by            csi-RS-Index when a value of a corresponding            pusch-PathlossReferenceRS-Id maps to a CSI-RS resource            index. The UE identifies a RS resource index q_(d) in the            set of RS resource indexes to correspond either to a SS/PBCH            block index or to a CSI-RS resource index as provided by            pusch-PathlossReferenceRS-Id in PUSCH-PathlossReferenceRS        -   If the PUSCH transmission is scheduled by a RAR UL grant as            described in Subclause 8.3, the UE uses the same RS resource            index q_(d) as for a corresponding PRACH transmission        -   If the UE is provided SRI-PUSCH-PowerControl and more than            one values of PUSCH-PathlossReferenceRS-Id, the UE obtains a            mapping from sri-PUSCH-PowerControlId in            SRI-PUSCH-PowerControl between a set of values for the SRI            field in DCI format 0_1 and a set of            PUSCH-PathlossReferenceRS-Id values. If the PUSCH            transmission is scheduled by a DCI format 0_1 that includes            a SRI field, the UE determines the RS resource index q_(d)            from the value of PUSCH-PathlossReferenceRS-Id that is            mapped to the SRI field value where the RS resource is            either on serving cell c or, if provided, on a serving cell            indicated by a value of pathlossReferenceLinking        -   If the PUSCH transmission is scheduled by a DCI format 0_0,            and if the UE is provided a spatial setting by            PUCCH-SpatialRelationInfo for a PUCCH resource with a lowest            index for active UL BWP b of each carrier f and serving cell            c, as described in Subclause 9.2.2, the UE uses the same RS            resource index q_(d) as for a PUCCH transmission in the            PUCCH resource with the lowest index        -   If the PUSCH transmission is scheduled by a DCI format 0_0            and if the UE is not provided a spatial setting for a PUCCH            transmission, or by a DCI format 0_1 that does not include a            SRI field, or if SRI-PUSCH-PowerControl is not provided to            the UE, the UE determines a RS resource index q_(d) with a            respective PUSCH-PathlossReferenceRS-Id value being equal to            zero where the RS resource is either on serving cell c or,            if provided, on a serving cell indicated by a value of            pathlossReferenceLinking        -   For a PUSCH transmission configured by            ConfiguredGrantConfig, if rrc-ConfiguredUplinkGrant is            included in ConfiguredGrantConfig, a RS resource index q_(d)            is provided by a value of pathlossReferencelndex included in            rrc-Configured UplinkG rant where the RS resource is either            on serving cell c or, if provided, on a serving cell            indicated by a value of pathlossReferenceLinking        -   For a PUSCH transmission configured by ConfiguredGrantConfig            that does not include rrc-ConfiguredUplinkGrant, the UE            determines a RS resource index q_(d) from a value of            PUSCH-PathlossReferenceRS-Id that is mapped to a SRI field            value in a DCI format activating the PUSCH transmission. If            the DCI format activating the PUSCH transmission does not            include a SRI field, the UE determines a RS resource index            q_(d) with a respective PUSCH-PathlossReferenceRS-Id value            being equal to zero where the RS resource is either on            serving cell c or, if provided, on a serving cell indicated            by a value of pathlossReferenceLinking    -   PL_(b,f,c)(q_(d))=referenceSignalPower−higher layer filtered        RSRP, where referenceSignalPower is provided by higher layers        and RSRP is defined in [7, TS 38.215] for the reference serving        cell and the higher layer filter configuration provided by        QuantityConfig is defined in [12, TS 38.331] for the reference        serving cell    -   If the UE is not configured periodic CSI-RS reception,        referenceSignalPower is provided by ss-PBCH-BlockPower. If the        UE is configured periodic CSI-RS reception, referenceSignalPower        is provided either by ss-PBCH-BlockPower or by        powerControlOffsetSS providing an offset of the CSI-RS        transmission power relative to the SS/PBCH block transmission        power [6, TS 38.214]. If powerControlOffsetSS is not provided to        the UE, the UE assumes an offset of 0 dB.        [ . . . ]

7.2 Physical Uplink Control Channel

[ . . . ]

7.2.1 UE Behaviour

If a UE transmits a PUCCH on active UL BWP b of carrier f in the primarycell c using PUCCH power control adjustment state with index l, the UEdetermines the PUCCH transmission power P_(PUCCH,b,f,c)(i,q_(u),q_(d),l)in PUCCH transmission occasion i as

${P_{{PUCCH},b,f,c}\left( {i,q_{u},q_{d},l} \right)} = {\min{\begin{Bmatrix}{{P_{{CMAX},f,c}(i)},} \\{{P_{{O\_ PUCCH},b,f,c}\left( q_{u} \right)} +} \\{10\;\log_{10}} \\{\left( {2^{\mu} \cdot {M_{{RB},b,f,c}^{PUCCH}(i)}} \right) +} \\{{{PL}_{b,f,c}\left( q_{d} \right)} +} \\{{\Delta_{F\_ PUCCH}(F)} +} \\{{\Delta_{{TF},b,f,c}(i)} + {g_{b,f,c}\left( {i,l} \right)}}\end{Bmatrix}\left\lbrack {{dB}\; m} \right\rbrack}}$where

-   -   P_(CMAX,f,c)(i) is the UE configured maximum output power        defined in [8-1, TS 38.101-1], [8-2, TS38.101-2] and [8-3,        TS38.101-3] for carrier f of serving cell c in PUCCH        transmission occasion i    -   P_(O_PUCCH,b,f,c)(q_(u)) is a parameter composed of the sum of a        component P_(O_NOMINAL_PUCCH), provided by p0-nominal, or        P_(O_NOMINAL_PUCCH)=0 dBm if p0-nominal is not provided, for        carrier f of primary cell c and, if provided, a component        P_(O_UE_PUCCH)(q_(u)) provided by p0-PUCCH-Value in P0-PUCCH for        active UL BWP b of carrier f of primary cell c, where        0≤q_(u)<<Q_(u). Q_(u) is a size for a set of P_(O_UE_PUCCH)        values provided by maxNrofPUCCH-P0-PerSet. The set of        P_(O_UE_PUCCH) values is provided by p0-Set. If p0-Set is not        provided to the UE, P_(O_UE_PUCCH) (q_(u))=0, 0≤q_(u)<Q_(u)        [ . . . ]    -   M_(RB,b,f,c) ^(PUCCH)(i) is a bandwidth of the PUCCH resource        assignment expressed in number of resource blocks for PUCCH        transmission occasion i on active UL BWP b of carrier f of        serving cell c and μ is a SCS configuration defined in [4, TS        38.211]    -   PL_(b,f,c)(q_(d)) is a downlink pathloss estimate in dB        calculated by the UE using RS resource index q_(d) as described        in Subclause 7.1.1 for the active DL BWP b of carrier f of the        primary cell c as described in Subclause 12        -   If the UE is not provided pathlossReferenceRSs or before the            UE is provided dedicated higher layer parameters, the UE            calculates PL_(b,f,c)(q_(d)) using a RS resource obtained            from the SS/PBCH block that the UE uses to obtain MIB        -   If the UE is provided a number of RS resource indexes, the            UE calculates PL_(b,f,c)(q_(d)) using RS resource with index            q_(d), where 0≤q_(d)<Q_(d)·Q_(d) is a size for a set of RS            resources provided by maxNrofPUCCH-PathlossReferenceRSs. The            set of RS resources is provided by pathlossReferenceRSs. The            set of RS resources can include one or both of a set of            SS/PBCH block indexes, each provided by ssb-Index in            PUCCH-PathlossReferenceRS when a value of a corresponding            pucch-PathlossReferenceRS-Id maps to a SS/PBCH block index,            and a set of CSI-RS resource indexes, each provided by            csi-RS-Index when a value of a corresponding            pucch-PathlossReferenceRS-Id maps to a CSI-RS resource            index. The UE identifies a RS resource in the set of RS            resources to correspond either to a SS/PBCH block index or            to a CSI-RS resource index as provided by            pucch-PathlossReferenceRS-Id in PUCCH-PathlossReferenceRS        -   If the UE is provided pathlossReferenceRSs and            PUCCH-SpatialRelationInfo, the UE obtains a mapping, by            indexes provided by corresponding values of            pucch-PathlossReferenceRS-Id, between a set of            pucch-SpatialRelationInfold values and a set of            referencesignal values provided by            PUCCH-PathlossReferenceRS. If the UE is provided more than            one values for pucch-SpatialRelationInfold and the UE            receives an activation command [11, TS 38.321] indicating a            value of pucch-SpatialRelationInfold, the UE determines the            referencesignal value in PUCCH-PathlossReferenceRS through            the link to a corresponding pucch-PathlossReferenceRS-Id            index. The UE applies the activation command in the first            slot that is after slot k+3·N_(slot) ^(subframe,μ) where k            is the slot where the UE transmits a PUCCH with HARQ-ACK            information for the PDSCH providing the activation command            and μ is the SCS configuration for the PUCCH transmission        -   If PUCCH-SpatialRelationInfo includes servingCellld            indicating a serving cell, the UE receives the RS for            resource index q_(d) on the active DL BWP of the serving            cell        -   If the UE is provided pathlossReferenceRSs and is not            provided PUCCH-SpatialRelationInfo, the UE obtains the            referencesignal value in PUCCH-PathlossReferenceRS from the            pucch-PathlossReferenceRS-Id with index 0 in            PUCCH-PathlossReferenceRS where the RS resource is either on            a same serving cell or, if provided, on a serving cell            indicated by a value of pathlossReferenceLinking    -   The parameter Δ_(F_PUCCH)(F) is provided by deltaF-PUCCH-f0 for        PUCCH format 0, deltaF-PUCCH-f1 for PUCCH format 1,        deltaF-PUCCH-f2 for PUCCH format 2, deltaF-PUCCH-f3 for PUCCH        format 3, and deltaF-PUCCH-f4 for PUCCH format 4        [ . . . ]

7.3 Sounding Reference Signals

For SRS, a UE splits a linear value {circumflex over(P)}_(SRS,b,f,c)(i,q_(s),l) of the transmit powerP_(SRS,b,f,c)(i,q_(s),l) on active UL BWP b of carrier f of serving cellc equally across the configured antenna ports for SRS.

7.3.1 UE Behaviour

If a UE transmits SRS on active UL BWP b of carrier f of serving cell cusing SRS power control adjustment state with index l, the UE determinesthe SRS transmission power P_(SRS,b,f,c)(i,q_(s),l) in SRS transmissionoccasion i as

${P_{{SRS},b,f,c}\left( {i,q_{s},l} \right)} = {\min{\begin{Bmatrix}{{P_{{CMAX},f,c}(i)},} \\{{P_{{O\_ SRS},b,f,c}\left( q_{s} \right)} +} \\{10\;\log_{10}} \\{\left( {2^{\mu} \cdot {M_{{SRS},b,f,c}(i)}} \right) +} \\{{\alpha_{{SRS},b,f,c}\left( q_{s} \right)} \cdot} \\{{{PL}_{b,f,c}\left( q_{d} \right)} +} \\{h_{b,f,c}\left( {i,l} \right)}\end{Bmatrix}\left\lbrack {{dB}\; m} \right\rbrack}}$where,

-   -   P_(CMAX,f,c)(i) is the UE configured maximum output power        defined in [8, TS 38.101-1], [8-2, TS38.101-2] and [TS 38.101-3]        for carrier f of serving cell c in SRS transmission occasion i    -   P_(O_SRS,b,f,c)(q_(s)) is provided by p0 for active UL BWP b of        carrier f of serving cell c and SRS resource set q_(s) provided        by SRS-ResourceSet and SRS-ResourceSetId    -   M_(SRS,b,f,c)(i) is a SRS bandwidth expressed in number of        resource blocks for SRS transmission occasion i on active UL BWP        b of carrier f of serving cell c and μ is a SCS configuration        defined in [4, TS 38.211]    -   α_(SRS,b,f,c)(q_(s)) is provided by alpha for active UL BWP b of        carrier f of serving cell c and SRS resource set q_(s)    -   PL_(b,f,c)(q_(d)) is a downlink pathloss estimate in dB        calculated by the UE using RS resource index q_(d) as described        in Subclause 7.1.1 for the active DL BWP of serving cell c and        SRS resource set q_(s) [6, TS 38.214]. The RS resource index        q_(d) is provided by pathlossReferenceRS associated with the SRS        resource set q_(s) and is either a ssb-Index providing a SS/PBCH        block index or a csi-RS-Index providing a CSI-RS resource index        -   If the UE is not provided pathlossReferenceRS or before the            UE is provided dedicated higher layer parameters, the UE            calculates PL_(b,f,c)(q_(d)) using a RS resource obtained            from the SS/PBCH block that the UE uses to obtain MIB        -   If the UE is provided pathlossReferenceLinking, the RS            resource is on a serving cell indicated by a value of            pathlossReferenceLinking            [ . . . ]

7.4 Physical Random Access Channel

A UE determines a transmission power for a physical random accesschannel (PRACH), P_(PRACH,b,f,c)(i), on active UL BWP b of carrier f ofserving cell c based on DL RS for serving cell c in transmissionoccasion i asP _(PRACHb,f,c)(i)=min{P _(CMAX,f,c)(i),P _(PRACH,target,f,c) +PL_(b,f,c)} [dBm],where P_(CMAX,f,c)(i) is the UE configured maximum output power definedin [8-1, TS 38.101-1], [8-2, TS38.101-2] and [38.101-3] for carrier f ofserving cell c within transmission occasion i, P_(PRACH,target,fc) isthe PRACH target reception power PREAMBLE_RECEIVED_TARGET_POWER providedby higher layers [11, TS 38.321] for the active UL BWP b of carrier f ofserving cell c, and PL_(b,f,c) is a pathloss for the active UL BWP b ofcarrier f based on the DL RS associated with the PRACH transmission onthe active DL BWP of serving cell c and calculated by the UE in dB asreferenceSignalPower−higher layer filtered RSRP in dBm, where RSRP isdefined in [7, TS 38.215] and the higher layer filter configuration isdefined in [12, TS 38.331]. If the active DL BWP is the initial DL BWPand for SS/PBCH block and CORESET multiplexing pattern 2 or 3, asdescribed in Subclause 13, the UE determines PL_(b,f,c) based on theSS/PBCH block associated with the PRACH transmission.

If a PRACH transmission from a UE is not in response to a detection of aPDCCH order by the UE, or is in response to a detection of a PDCCH orderby the UE that triggers a contention based random access procedure, oris associated with a link recovery procedure where a corresponding indexq_(new) is associated with a SS/PBCH block, as described in Subclause 6,referenceSignalPower is provided by ss-PBCH-BlockPower.

If a PRACH transmission from a UE is in response to a detection of aPDCCH order by the UE that triggers a non-contention based random accessprocedure and depending on the DL RS that the DM-RS of the PDCCH orderis quasi-collocated with as described in Subclause 10.1,referenceSignalPower is provided by ss-PBCH-BlockPower or, if the UE isconfigured resources for a periodic CSI-RS reception or the PRACHtransmission is associated with a link recovery procedure where acorresponding index q_(new) is associated with a periodic CSI-RSconfiguration as described in Subclause 6, referenceSignalPower isobtained by ss-PBCH-BlockPower and powerControlOffsetSS wherepowerControlOffsetSS provides an offset of CSI-RS transmission powerrelative to SS/PBCH block transmission power [6, TS 38.214]. IfpowerControlOffsetSS is not provided to the UE, the UE assumes an offsetof 0 dB. If the active TCI state for the PDCCH that provides the PDCCHorder includes two RS, the UE expects that one RS has QCL-TypeDproperties and the UE uses the one RS when applying a value provided bypowerControlOffsetSS.

If within a random access response window, as described in Subclause8.2, the UE does not receive a random access response that contains apreamble identifier corresponding to the preamble sequence transmittedby the UE, the UE determines a transmission power for a subsequent PRACHtransmission, if any, as described in [11, TS 38.321].

In RAN1 #94 meeting (as captured in 3GPP R1-1810051), RAN1 has someagreements about NR V2X.

Agreements:

-   -   RAN1 assumes that higher layer decides if a certain data has to        be transmitted in a unicast, groupcast, or broadcast manner and        inform the physical layer of the decision. For a transmission        for unicast or groupcast, RAN1 assumes that the UE has        established the session to which the transmission belongs to.        Note that RAN1 has not made agreement about the difference among        transmissions in unicast, groupcast, and broadcast manner.        [ . . . ]

Agreements:

-   -   At least PSCCH and PSSCH are defined for NR V2X. PSCCH at least        carries information necessary to decode PSSCH.        [. . . ]

Agreements:

RAN1 to continue study on multiplexing physical channels considering atleast the above aspects:

-   -   Multiplexing of PSCCH and the associated PSSCH (here, the        “associated” means that the PSCCH at least carries information        necessary to decode the PSSCH).        -   Study further the following options:            -   [. . . ]            -   Option 3: A part of PSCCH and the associated PSSCH are                transmitted using overlapping time resources in                non-overlapping frequency resources, but another part of                the associated PSSCH and/or another part of the PSCCH                are transmitted using non-overlapping time resources.                [. . . ]

Agreements:

-   -   At least two sidelink resource allocation modes are defined for        NR-V2X sidelink communication        -   Mode 1: Base station schedules sidelink resource(s) to be            used by UE for sidelink transmission(s)        -   Mode 2: UE determines (i.e. base station does not schedule)            sidelink transmission resource(s) within sidelink resources            configured by base station/network or pre-configured            sidelink resources

In RAN1 #94bis meeting (as captured in 3GPP R1-1812101), RAN1 has someagreements about NR V2X.

Agreements:

-   -   For unicast, sidelink HARQ feedback and HARQ combining in the        physical layer are supported.        -   FFS details, including the possibility of disabling HARQ in            some scenarios    -   For groupcast, sidelink HARQ feedback and HARQ combining in the        physical layer are supported.        -   FFS details, including the possibility of disabling HARQ in            some scenarios

Conclusion:

-   -   To update the TR 37.885 by replacing “multicast” by “groupcast”

Agreements:

Sidelink control information (SCI) is defined.

-   -   SCI is transmitted in PSCCH.    -   SCI includes at least one SCI format which includes the        information necessary to decode the corresponding PSSCH.        -   NDI, if defined, is a part of SCI.

Sidelink feedback control information (SFCI) is defined.

-   -   SFCI includes at least one SFCI format which includes HARQ-ACK        for the corresponding PSSCH.        -   FFS whether a solution will use only one of “ACK,” “NACK,”            “DTX,” or use a combination of them.

Agreements:

At least resource pool is supported for NR sidelink

-   -   Resource pool is a set of time and frequency resources that can        be used for sidelink transmission and/or reception.    -   [. . . ]    -   UE assumes a single numerology in using a resource pool.    -   Multiple resource pools can be configured to a single UE in a        given carrier.

In RAN1 #95 meeting (as captured in 3GPP R1-1901482), RAN1 has someagreements about NR V2X.

Agreements:

-   -   BWP is defined for NR sidelink.        -   In a licensed carrier, SL BWP is defined separately from BWP            for Uu from the specification perspective.            -   FFS the relation with Uu BWP.        -   The same SL BWP is used for both Tx and Rx.        -   Each resource pool is (pre)configured within a SL BWP.        -   Only one SL BWP is (pre)configured for RRC idle or out of            coverage NR V2X UEs in a carrier.        -   For RRC connected UEs, only one SL BWP is active in a            carrier. No signalling is exchanged in sidelink for            activation and deactivation of SL BWP.            -   Working assumption: only one SL BWP is configured in a                carrier for a NR V2X UE                -   Revisit in the next meeting if significant issues                    are found        -   Numerology is a part of SL BWP configuration.

Agreements:

-   -   Physical sidelink feedback channel (PSFCH) is defined and it is        supported to convey SFCI for unicast and groupcast via PSFCH.

Agreements:

-   -   When SL HARQ feedback is enabled for unicast, the following        operation is supported for the non-CBG case:        -   Receiver UE generates HARQ-ACK if it successfully decodes            the corresponding TB. It generates HARQ-NACK if it does not            successfully decode the corresponding TB after decoding the            associated PSCCH which targets the receiver UE.

Agreements:

-   -   When SL HARQ feedback is enabled for groupcast, the following        operations are further studied for the non-CBG case:        -   Option 1: Receiver UE transmits HARQ-NACK on PSFCH if it            fails to decode the corresponding TB after decoding the            associated PSCCH. It transmits no signal on PSFCH otherwise.            [ . . . ]        -   Option 2: Receiver UE transmits HARQ-ACK on PSFCH if it            successfully decodes the corresponding TB. It transmits            HARQ-NACK on PSFCH if it does not successfully decode the            corresponding TB after decoding the associated PSCCH which            targets the receiver UE.            [. . . ]

In RAN1 #AH_1901 meeting (as captured in 3GPP R1-1901483), RAN1 has someagreements about NR V2X.

Agreements:

-   -   Confirm the working assumption        -   Working assumption: only one SL BWP is configured in a            carrier for a NR V2X UE

Agreements:

-   -   Configuration for SL BWP is separated from Uu BWP configuration        signalling.        -   UE is not expected to use different numerology in the            configured SL BWP and active UL BWP in the same carrier at a            given time.

Agreements:

-   -   SL open-loop power control is supported.        -   For unicast, groupcast, broadcast, it is supported that the            open-loop power control is based on the pathloss between TX            UE and gNB (if TX UE is in-coverage).            -   This is at least to mitigate interference to UL                reception at gNB.            -   Rel-14 LTE sidelink open-loop power control is the                baseline.            -   gNB should be able to enable/disable this power control.        -   At least for unicast, it is supported that the open-loop            power control is also based on the pathloss between TX UE            and RX UE.            -   (Pre-)configuration should be able to enable/disable                this power control.            -   FFS whether this is applicable to groupcast            -   FFS whether this requires information signaling in the                sidelink.        -   Further study its potential impact, e.g., on resource            allocation.

Agreements:

-   -   Long-term measurement of sidelink signal is supported at least        for unicast.        -   Long-term measurement here means a measurement with L3            filtering.        -   This measurement is used at least for the open-loop power            control.

In RAN1 #96 meeting (as captured in 3GPP R1-1905837), RAN1 has someagreements about NR V2X.

Agreements:

-   -   For the operation regarding PSSCH, a UE performs either        transmission or reception in a slot on a carrier.

Agreements:

-   -   For unicast RX UEs, SL-RSRP is reported to TX UE    -   For sidelink open loop power control for unicast for the TX UE,        TX UE derives pathloss estimation        -   Revisit during the WI phase w.r.t. whether or not there is a            need regarding how to handle pathloss estimation for OLPC            before SL-RSRP is available for a RX UE

Agreements:

-   -   TPC commands for SL PC are not supported

Agreements:

-   -   RAN1 concludes the following regarding beam management:        -   Beam management is beneficial        -   RAN1 has conducted limited study on the beam management.        -   In FR1, it is feasible to support V2X use cases without beam            management.        -   In FR2, it is feasible to support some V2X use cases without            beam management in some scenarios.            -   Panel selection is necessary to improve the                communication range in FR2.

In RAN1 #97 meeting (as captured in the Draft Report of 3GPP TSG RAN WG1#97 v0.1.0), RAN1 has some agreements about NR V2X.

Agreements:

-   -   For mode 1:        -   A dynamic grant by the gNB provides resources for            transmission of PSCCH and PSSCH.

Agreements:

-   -   Resource selection window is defined as a time interval where a        UE selects sidelink resources for transmission        -   The resource selection window starts T1≥0 after a resource            (re-)selection trigger and is bounded by at least a            remaining packet delay budget

Agreements:

-   -   Support a sub-channel as the minimum granularity in frequency        domain for the sensing for PSSCH resource selection

Agreements:

-   -   For sidelink transmit power control,        -   Total sidelink transmit power is the same in the symbols            used for PSCCH/PSSCH transmissions in a slot.            -   FFS whether/how to handle simultaneous transmission of                sidelink and uplink        -   The maximum SL transmit power is (pre-)configured to the TX            UE.            -   FFS on details (e.g., whether the maximum power is                dependent of parameters such as the priority of                PSCCH/PSSCH)

Agreements:

-   -   For the SL open-loop power control, a UE can be configured to        use DL pathloss (between TX UE and gNB) only, SL pathloss        (between TX UE and RX UE) only, or both DL pathloss and SL        pathloss.    -   When the SL open-loop power control is configured to use both DL        pathloss and SL pathloss,        -   The minimum of the power values given by open-loop power            control based on DL pathloss and the open-loop power control            based on SL pathloss is taken.            -   (Working assumption) P0 and alpha values are separately                (pre-)configured for DL pathloss and SL pathloss.

3GPP R1-1907682 summaries company's view about sidelink power control.

2. Sidelink Power Control

-   -   Issue 2-1: How to perform SL TX power control for PSCCH and        PSSCH considering PSCCH/PSSCH multiplexing Option 3? In detail,        company's view and its rationale are as follows:    -   Proposal for agreement (offline consensus)        -   For sidelink transmit power control,            -   Total sidelink transmit power is the same in the symbols                used for PSCCH/PSSCH transmissions in a slot.                -   FFS whether/how to handle simultaneous transmission                    of sidelink and uplink            -   The maximum SL transmit power is (pre-)configured to the                TX UE.                -   FFS on details (e.g., whether the maximum power is                    dependent of parameters such as the priority of                    PSCCH/PSSCH)    -   Issue 2-2: How to use SL pathloss-based open-loop power control?        In detail, company's view and its rationale are as follows:    -   Observation        -   Majority companies support open-loop power control based on            the pathloss between Tx UE and Rx UE for groupcast, and            there is a comment that SL-RSRP reporting may create high            traffic load in the network.            -   Companies are encouraged to continue to discuss whether                SL pathloss-based open-loop power control is applicable                to groupcast considering signaling overhead for SL-RSRP                reporting.        -   Majority companies support taking the minimum of the power            calculated by DL pathloss and SL pathloss when both DL            pathloss and SL pathloss are enabled.        -   Companies are encouraged to further discuss whether SL            pathloss is used for open-loop power control for PSCCH or            PSFCH    -   Proposal for agreement (offline consensus)        -   For the SL open-loop power control, a UE can be configured            to use DL pathloss (between TX UE and gNB) only, SL pathloss            (between TX UE and RX UE) only, or both DL pathloss and SL            pathloss.        -   When the SL open-loop power control is configured to use            both DL pathloss and SL pathloss,            -   The minimum of the power values given by open-loop power                control based on DL pathloss and the open-loop power                control based on SL pathloss is taken.                -   P0 and alpha values are separately (pre-)configured                    for DL pathloss and SL pathloss.

One or multiple of following terminologies may be used hereafter:

-   -   BS: A network central unit or a network node in NR which is used        to control one or multiple TRPs which are associated with one or        multiple cells. Communication between BS and TRP(s) is via        fronthaul. BS could also be referred to as central unit (CU),        eNB, gNB, or NodeB.    -   TRP: A transmission and reception point provides network        coverage and directly communicates with UEs. TRP could also be        referred to as distributed unit (DU) or network node.    -   Cell: A cell is composed of one or multiple associated TRPs,        i.e. coverage of the cell is composed of coverage of all        associated TRP(s). One cell is controlled by one BS. Cell could        also be referred to as TRP group (TRPG).    -   Beam sweeping: In order to cover all possible directions for        transmission and/or reception, a number of beams is required.        Since it is not possible to generate all these beams        concurrently, beam sweeping means to generate a subset of these        beams in one time interval and change generated beam(s) in other        time interval(s), i.e. changing beam in time domain. So, all        possible directions can be covered after several time intervals.    -   Beam sweeping number: A necessary number of time interval(s) to        sweep beams in all possible directions once for transmission        and/or reception. In other words, a signaling applying beam        sweeping would be transmitted “beam sweeping number” of times        within one time period, e.g. the signaling is transmitted in (at        least partially) different beam(s) in different times of the        time period.    -   Serving beam: A serving beam for a UE is a beam generated by a        network node, e.g. TRP, which is currently used to communicate        with the UE, e.g. for transmission and/or reception.    -   Candidate beam: A candidate beam for a UE is a candidate of a        serving beam. Serving beam may or may not be candidate beam.    -   Qualified beam: A qualified beam is a beam with radio quality,        based on measuring signal on the beam, better than a threshold.    -   The best serving beam: The serving beam with the best quality        (e.g. the highest BRSRP value).    -   The worst serving beam: The serving beam with the worst quality        (e.g. the worst BRSRP value).    -   NR-PDCCH: A channel carries downlink control signal which is        used to control communication between a UE and a network side. A        network transmits NR-PDCCH on configured control resource set        (CORESET) to the UE.    -   UL-control signal: An UL-control signal may be scheduling        request (SR), channel state information (CSI), HARQ-ACK/NACK for        downlink transmission    -   Slot: a scheduling unit in NR. Slot duration is 14 OFDM symbols.    -   Mini-slot: A scheduling unit with duration less than 14 OFDM        symbols.    -   Slot format information (SFI): Information of slot format of        symbols in a slot. A symbol in a slot may belong to following        type: downlink, uplink, unknown or other. The slot format of a        slot could at least convey transmission direction of symbols in        the slot.    -   DL common signal: Data channel carrying common information that        targets for multiple UEs in a cell or all UEs in a cell.        Examples of DL common signal could be system information,        paging, RAR.

One or multiple of following assumptions for network side may be usedhereafter:

-   -   Downlink timing of TRPs in the same cell are synchronized.    -   RRC layer of network side is in BS.

One or multiple of following assumptions for UE side may be usedhereafter:

-   -   There are at least two UE (RRC) states: connected state (or        called active state) and non-connected state (or called inactive        state or idle state). Inactive state may be an additional state        or belong to connected state or non-connected state.

For LTE/LTE-A V2X (Vehicle-to-Everything) and/or P2X(Pedestrian-to-Everything) transmission, there are two transmissionmodes: one is scheduled via network, such as sidelink transmission mode3 (as discussed in 3GPP TS 36.214); the other one is resource selectionby device, such as sidelink transmission mode 4 (as discussed in 3GPP TS36.214). Since the resource selection by device is not scheduled vianetwork, the UE requires performing sensing before selecting a resourcefor transmission, in order to avoid resource collision and interferencefrom or in other UEs. In LTE/LTE-A Release 14, a V2X resource pool isconfigured with one of transmission modes. Thus, the two transmissionmodes are not mixed utilized in a V2X resource pool. In LTE/LTE-ARelease 15, it is supported that the two transmission modes can be mixedutilized in a V2X resource pool.

For sidelink transmission mode 3, the network node may transmit asidelink (SL) grant, e.g. DCI (Downlink Control Information) format 5Ain LTE/LTE-A, on Uu interface for scheduling PSCCH (Physical SidelinkControl Channel) and/or PSSCH (Physical Sidelink Shared Channel). TheV2X UE may perform PSCCH and PSSCH on PC5 interface, in response to thereceive DCI format 5A. Note that the V2X UE does not feedback HARQ-ACKassociated with reception the DCI format 5A to network node. The Uuinterface means the wireless interface for communication between networkand UE. The PC5 interface means the wireless interface for communicationbetween UEs.

A DCI format 5A may schedule one transmission occasion of PSCCH and/orPSSCH, wherein the DCI format 5A is with CRC scrambled via SL-V-RNTI(Sidelink V2X RNTI). Alternative, the DCI format 5A may schedulesemi-persistent periodic transmission occasions of PSCCH and/or PSSCH,wherein the DCI format 5A is with CRC scrambled via SL-SPS-V-RNTI. Morespecifically, the DCI format 5A with CRC scrambled via SL-SPS-V-RNTI mayactivate or release semi-persistent periodic transmission occasions ofPSCCH and/or PSSCH. The periodicity may be configured in RRC with one of20, 50, 100, 200, . . . , 1000 ms.

For one transmission occasion, the UE performs a PSSCH (new)transmission and/or a PSSCH retransmission for a transport block. For ntransmission occasions, the UE performs n PSSCH (new) transmissionsand/or n PSSCH retransmissions for n transport blocks.

For both transmission mode 3 and 4 for LTE/LTE-A V2X and/or P2Xtransmission, the transmission power of PSCCH and PSSCH only supportsopen-loop power control. It means that the transmit power of PSCCH andPSSCH is determined by resource bandwidth, power parameters (such as P0and/or α), and a downlink pathloss (PL). The downlink pathloss isderived from measuring DL RS (DownLink Reference Signal) transmittedfrom network node. The power parameter is (semi-statically) configured.Thus, the network node does not dynamically adjust the transmit power ofPSCCH and PSSCH from a transmitter UE, i.e. power control (TPC) commandis not supported for V2X sidelink communication. Since the V2X and P2Xtransmission in LTE/LTE-A is designed for broadcast transmission, thereis no need for network to fine tune the transmit power. The network onlyneeds to ensure that the PSCCH and PSSCH transmissions do not inducesevere interference for other UEs in Uu interface. Thus, that is whydownlink pathloss between network node and the transmitter UE is oneparameter for deriving transmit power of PSCCH and/or PSSCH. Moreover,P_(CMAX) and P_(MAX_CBR) for transmission mode 4 are considered asmaximum transmit power restriction for PSCCH and PSSCH transmissions.

In NR V2X, unicast, groupcast, and broadcast sidelink transmission aresupported. At least two sidelink resource allocation modes are definedfor NR-V2X sidelink communication. Mode 1 is that base station ornetwork node can schedule sidelink resource(s) to be used by UE forsidelink transmission(s). Mode 2 is that UE determines (i.e. basestation or network node does not schedule) sidelink transmissionresource(s) within sidelink resources configured by base station ornetwork node or pre-configured sidelink resources. The mode 3 in LTE V2Xmay be a start point or basis for study mode 1 in NR V2X. The mode 4 inLTE V2X may be a start point or basis for study mode 2 in NR V2X.

To increase high reliability and reduce interference, it may beconsidered to enhance sidelink power control. Since there are specificone or multiple receiving devices for unicast and groupcasttransmissions, the transmission power derivation may be enhanced withconsideration of channel quality and propagation pathloss betweentransmitting device and receiving device(s). With accurate transmitpower control, the reception reliability of V2X transmission can beguaranteed without inducing unnecessary interference to other devices.Power utilization is more efficient without wasting unnecessary transmitpower.

Currently, it is agreed to support sidelink pathloss based open-looppower control at least for unicast. The sidelink pathloss basedopen-loop power control means that the pathloss for deriving sidelinktransmit power is the propagation pathloss between device and device,instead of between network node and device. It is because the pathlossbetween device and device may reflect the required power for receptionmore accurately. If the distance between device and device is longer,more pathloss compensation will be required for sidelink communicationbetween the two devices. If the distance between device and device isshorter, less pathloss compensation will be required for sidelinkcommunication between the two devices. One possible embodiment is that adevice A transmits a signal in PC5 interface, and a device B measuresthe signal and derives a sidelink pathloss value. When the device Btransmits a sidelink channel transmission to the device A, the transmitpower of the sidelink channel transmission may be derived from thederived sidelink pathloss value.

In one embodiment, if the device B knows the transmit power of thesignal at device A, the sidelink pathloss value may be derived as thetransmit power of the signal minus the received power of the signal atdevice B. The received power may mean RSRP (Reference Signal ReceivedPower). Moreover, the device B may report a measured power of the signalto the device A (such as SL RSRP report). The device A can derive thesidelink pathloss value based on the report, and then derives a transmitpower of sidelink channel transmission to the device B.

Furthermore, it is agreed that open-loop power control for unicast,groupcast, broadcast sidelink transmission can be based on the pathlossbetween TX device and gNB (if TX device is in-coverage). This is tomitigate interference to UL (Uplink) reception at gNB.

Based on the RAN1 agreement for the SL open-loop power control (ascaptured in 3GPP R1-1905921), a device can be configured to use DLpathloss (between TX UE and gNB) only, SL pathloss (between TX UE and RXUE) only, or both DL pathloss and SL pathloss. When the SL open-looppower control is configured to use both DL pathloss and SL pathloss, theminimum of the power values given by open-loop power control based on DLpathloss and the open-loop power control based on SL pathloss is taken.Preferably, P0 and alpha values may be separately (pre-)configured forDL pathloss and SL pathloss.

In NR Uu interface, there are some alternatives for deriving DL(Downlink) pathloss, which is used for determining uplink transmitpower, such as for PUSCH, PUCCH, SRS, and PRACH (Physical Random AccessChannel). Such alternatives are to consider beam operation, since thenetwork node may transmit different channels or different referencesignal in respective network beam. More specifically, SS(Synchronization)/PBCH (Physical Broadcast Channel) block with differentindexes may be transmitted from different network beams. CSI-RS (ChannelState Information-Reference Signal) with different resource indexes maybe transmitted from different network beams. Even downlink channeltransmission in different TTIs (Transmission Time Intervals) may betransmitted from different network beams, thus DMRS (DemodulationReference Signal) of downlink channel transmissions in different TTIsmay not be considered as quasi-collocated with each other. Suchalternatives applied for NR uplink transmissions (as discussed in 3GPPTS 38.213) are summarized as shown in FIG. 8.

-   -   For a PRACH transmission, the DL pathloss for determining the        PRACH transmission power is derived based on the DL RS        associated with the PRACH transmission (such as associated        SS/PBCH block). Such association between DL RS and PRACH may be        configured. In general, the DL RS may be a SS/PBCH block. In        some cases, the DL RS may be a periodic CSI-RS.    -   Depending on different situations, the DL pathloss for        determining SRS transmit power can be derived based on a SS/PBCH        block that the UE uses to obtain MIB (Master Information Block),        or DL RS associated with a configured RS resource index. The RS        index may correspond to a SS/PBCH block index or a CSI-RS        resource index.    -   Depending on different situations, the DL pathloss for        determining PUCCH transmit power can be derived based on a        SS/PBCH block that the UE uses to obtain MIB, DL RS associated        with a RS resource index indicated by MAC activation command, or        DL RS associated with a RS resource index with index 0. The RS        index may correspond to a SS/PBCH block index or a CSI-RS        resource index.    -   Depending on different situations, the DL pathloss for        determining PUSCH transmit power can be derived based on a        SS/PBCH block that the UE uses to obtain MIB, DL RS associated        with a RS resource index as for corresponding PRACH (if the        PUSCH is msg3), DL RS associated with a RS resource index mapped        to indicated SRI field, DL RS associated with a RS resource        index for PUCCH transmission in the PUCCH resource with the        lowest index, DL RS associated with a RS resource index with        index 0, or DL RS associated with a configured RS resource        index. The RS index may correspond to a SS/PBCH block index or a        CSI-RS resource index.

However, for determining sidelink transmit power, it is not clear how toobtain or derive required DL pathloss. In one way, the DL pathlossderivation for sidelink may select one or more than one alternativesapplied for NR uplink transmissions. Moreover, new alternative may berequired considering different characteristics between sidelink anduplink.

First consideration is that a device performing sidelink transmission orreception may be RRC-idle mode in Uu interface. It means that the devicehas no configuration about DL RS resource index and its correspondence.The V2X device has no configuration about CSI-RS resources. The V2Xdevice has no configuration or information about the SS (SynchronizationSignal) or PBCH (Physical Broadcast Channel) block occasions, which arereally transmitted by network node. The device may not perform PRACHtransmission. Thus, almost all alternatives are not applied for thedevice in RRC-idle mode.

Second consideration is that the network node may not keep tracking fora device. It is especially for the device operated or configured as mode2 for sidelink transmission. Since the device obtains or selectssidelink resource based on sensing without network assistance orscheduling, the network node may have no need to adjust DL network beamsof DL RSs for the device in time. Accordingly, the DL network beams ofthe DL RSs does not direct or point toward the device accurately, thusthe DL pathloss derived based on the DL RSs is not accurate or valid forthe device to determine sidelink transmit power.

Third consideration is that a sidelink transmission from a transmittingdevice is for successful reception of one or more than one receivingdevice, instead of successful reception of network node. For downlinkand sidelink, there is no close or tight linkage as that between (DLbeam of) a DL RS and (UL beam of) a UL transmission in Uu interface. Inother words, if the network node expects to receive a UL transmission onone network beam, the network may indicate the device to perform the ULtransmission on one device beam corresponding to the one network beam,where a DL pathloss for determining UL transmit power of the ULtransmission is derived based on a DL RS transmitted on the one networkbeam. However, since the network may not need to receive sidelinktransmission from a device, the DL pathloss for determining sidelinktransmit power may be derived based on DL RS without limitation on anyspecific network beam. In this case, a network beam with smallest DLpathloss may be properly considered for determining sidelink transmitpower.

To determine sidelink transmit power, following are some methods toobtain or derive required DL pathloss.

Method A

The general concept of method A is that a transmitting device mayreceive a downlink control transmission from network. In one embodiment,the downlink control transmission may deliver or include a grant,wherein the grant may indicate one or multiple sidelink resources.Alternatively, the downlink control transmission may schedule a downlinkdata transmission delivering system information for sidelinkcommunication. The DL pathloss for determining the sidelink transmitpower may be derived based on a DL RS associated with reception,monitoring, or detection of the downlink control transmission.

In one embodiment, the transmitting device may be configured withnetwork scheduling mode, such as NR mode 1, for sidelink transmission.The transmitting device may be configured with a mixed mode supportingnetwork scheduling mode and/or device self-determination mode, such asNR mode 1 and/or mode 2, for sidelink transmission. In the case, thetransmitting device may derive DL pathloss, for determining the sidelinktransmit power, based on a DL RS associated with reception, monitoring,or detection of the downlink control transmission, wherein the downlinkcontrol transmission may deliver or include the grant for sidelink ormay schedule a downlink data transmission delivering system informationfor sidelink communication.

In one embodiment, the transmitting device may be configured with deviceself-determination mode, such as NR mode 2, for sidelink transmission.In this case, the transmitting device may derive DL pathloss, fordetermining the sidelink transmit power, based on a DL RS associatedwith reception, monitoring, or detection of the downlink controltransmission, wherein the downlink control transmission may schedule adownlink data transmission delivering system information for sidelinkcommunication. It is because that the transmitting device configuredwith device self-determination mode may not receive or monitor the grantfor sidelink.

In one embodiment, the transmitting device may derive a DL pathlossvalue based on DMRS (Demodulation Reference Signal) of the downlinkcontrol transmission. The DMRS is utilized for demodulation of thedownlink control transmission. The DL pathloss value may be calculatedby L1-RSRP. The RSRP may be DMRS-RSRP.

In one embodiment, the transmitting device may derive a DL pathlossvalue based on a DL RS or DMRS associated with a CORESET (ControlResource Set), wherein the transmitting device receives, monitors, ordetects the downlink control transmission in the CORESET. The DL RS maymean a SS or PBCH block or a CSI-RS. The DMRS is utilized fordemodulation of the downlink control transmission. In one embodiment,the DL pathloss value may be calculated by L1-RSRP. Alternatively, theDL pathloss value may be calculated by higher layer filtered -RSRP. TheRSRP may be any of SS-RSRP, CSI-RSRP, or DMRS-RSRP.

In one embodiment, the transmitting device may derive a DL pathlossvalue based on a DL RS or DMRS associated with a specific CORESET. Thespecific CORESET may mean a CORESET with index zero. The specificCORESET may be configured by network node, such as based on a configuredCORESET index.

Alternatively, the specific CORESET may mean:

-   -   a CORESET in which the transmitting device receives a last or        most recent downlink control transmission with the grant;    -   a CORESET in which the transmitting device receives a last or        most recent downlink control transmission which schedules a        downlink data transmission delivering system information for        sidelink communication;    -   a last or most recent CORESET in which the transmitting device        monitors a downlink control transmission for a grant; or    -   a last or most recent CORESET in which the transmitting device        monitors a downlink control transmission for acquiring system        information for sidelink communication.

In one embodiment, the transmitting device may receive, monitor, ordetect the downlink control transmission in the specific CORESET.Alternatively, the transmitting device may receive, monitor, or detectmultiple CORESETs, wherein the multiple CORESETs comprise the specificCORESET. The DL RS may mean a SS or PBCH block or a CSI-RS. The DMRS maybe utilized for demodulation of the downlink control transmission. Inone embodiment, the DL pathloss value may be calculated by L1-RSRP.Alternatively, the DL pathloss value may be calculated by higher layerfiltered -RSRP. The RSRP may be any of SS-RSRP, CSI-RSRP, or DMRS-RSRP.

In one embodiment, the transmitting device may perform one or multiplesidelink transmission(s) on the one or multiple sidelink resources, suchas given by the grant or selected by the transmitting device. Thesidelink transmit power of the one or multiple sidelink transmission(s)is determined or derived based on the DL pathloss value. In oneembodiment, a power value derived based on the DL pathloss value may bean upper bound of sidelink transmit power of the one or multiplesidelink transmission(s).

FIG. 9 shows multiple possible embodiments. For a sidelink resourcepool, the sidelink resources in time domain may occupy a subset of slotsutilized for sidelink, i.e. sidelink slots. Within a slot, all thesymbols or only a subset of consecutive symbols may be available forsidelink. Moreover, within the sidelink slots associated with theresource pool, PSFCH resources can be (pre)configured periodically witha period of N sidelink slot(s). N is assumed to be 4 in FIG. 9.

The transmitting device may receive DL transmission, channel, or RS(Reference Signal) in DL symbols and/or DL slots. The transmittingdevice may derive DL pathloss value based on DL RS or DMRS (DemodulationReference Signal) measured or received in DL symbols and/or DL slots.

The transmitting device may receive a PDCCH 0 delivering or including aSL grant 0, wherein the SL grant 0 may indicate resources of PSSCH 1˜6.Note that PSSCH 1˜6 may be in different SL slots. PSSCH 1˜6 may be indifferent frequency resources. PSSCH 1˜6 may be with the same size ofoccupied subchannel(s), but with different starting subchannel index. Inone embodiment, PSSCH 1˜6 may carry a first same TB.

The transmitting device may receive a PDCCH 1 delivering or including aSL grant 1, wherein the SL grant 1 may indicate resources of PSSCH11˜15. PSSCH 11˜15 may be in different frequency resources. PSSCH 11˜15may be with the same size of occupied subchannel(s), but with differentstarting subchannel index. In one embodiment, PSSCH 11˜15 may carry asecond same TB.

-   -   In one embodiment, the transmitting device may derive a DL        pathloss value DL_PL 1 for determining or deriving a transmit        power P_(PSSCH1) of PSSCH 1. The transmit power        P_(PSSCH2)˜P_(PSSCH6) of PSSCH 2˜6 is set as the same as        P_(PSSCH1). In one embodiment, DL_PL 1 may be derived based on        DMRS of PDCCH 0. Alternatively, DL_PL 1 may be derived based on        a DL RS or DMRS associated with a CORESET, wherein the        transmitting device receives PDCCH 0 in the CORESET.        Alternatively, DL_PL 1 may be derived based on a DL RS or DMRS        associated with a specific CORESET.

Moreover, the transmitting device may derive a DL pathloss value DL_PL 2for determining or deriving a transmit power P_(PSSCH11) of the PSSCH11. The transmit power P_(PSSCH12)˜P_(PSSCH15) of PSSCH 12˜15 is set asthe same as P_(PSSCH11). In one embodiment, DL_PL 2 may be derived basedon DMRS of PDCCH 1. Alternatively, DL_PL 2 may be derived based on a DLRS or DMRS associated with a CORESET, wherein the transmitting devicereceives PDCCH 1 in the CORESET. Alternatively, DL_PL 2 may be derivedbased on a DL RS or DMRS associated with a specific CORESET.

In one embodiment, the transmitting device may receive PDCCH 0 and PDCCH1 in different CORESETs. Alternatively, the transmitting device mayreceive PDCCH 0 and PDCCH 1 in the same CORESET.

In one embodiment, the transmit power P_(PSSCH1) and the transmit powerP_(PSSCH11) are determined or derived respectively. The transmit powerP_(PSSCH1) may be different from the transmit power P_(PSSCH11).

-   -   In one embodiment, the transmitting device may derive DL        pathloss value separately for each of PSSCH 1˜6. The        transmitting device may determine or derive the sidelink        transmit power of PSSCH based on the last or newest DL pathloss        value, which is utilized for determining the sidelink transmit        power. As shown in the instance, the transmitting device may        derive a DL pathloss value DL_PL 1 before PSSCH 1, and utilize        DL_PL 1 for determining or deriving a transmit power P_(PSSCH1)        of PSSCH 1. Since the transmitting device may not derive another        new DL pathloss value before PSSCH 2, the transmitting device        may utilize DL_PL 1 for determining or deriving a transmit power        P_(PSSCH2) of PSSCH 2.

When the transmitting device derives a DL pathloss value DL_PL 2, thetransmitting device utilizes DL_PL 2 for determining or deriving atransmit power P_(PSSCH3) and the transmit power P_(PSSCH11),P_(PSSCH12). When the transmitting device derives a DL pathloss valueDL_PL 3, the transmitting device may utilize DL_PL 3 for determining orderiving a transmit power P_(PSSCH4) and the transmit power P_(PSSCH13)since DL_PL 3 is the last or newest DL pathloss value for PSSCH 4 andPSSCH 13.

When the transmitting device derives a DL pathloss value DL_PL 4, thetransmitting device may utilize DL_PL 4 for determining or deriving atransmit power P_(PSSCH5) and the transmit power P_(PSSCH14) since DL_PL4 is the last or newest DL pathloss value for PSSCH 5 and PSSCH 14.

When the transmitting device derives a DL pathloss value DL_PL 5, thetransmitting device may utilize DL_PL 5 for determining or deriving atransmit power P_(PSSCH6) since DL_PL 5 is the last or newest DLpathloss value for PSSCH 6.

When the transmitting device derives a DL pathloss value DL_PL 6, thetransmitting device may utilize DL_PL 6 for determining or deriving atransmit power P_(PSSCH15) since DL_PL 6 is the last or newest DLpathloss value for PSSCH 15.

In one embodiment, DL_PL 1˜6 may be derived based on a DL RS or DMRSassociated with a specific CORESET. Any of DL_PL 1˜6 derived based on DLRS or DMRS associated with the specific CORESET can be utilized fordetermining or deriving the transmit power P_(PSSCH1)˜P_(PSSCH6) andP_(PSSCH11)˜P_(PSSCH15).

In one embodiment, the transmitting device may receive PDCCH 0 and PDCCH1 in the same CORESET. Alternatively, DL_PL 1˜6 may be derived based onDL RS or DMRS associated with the same CORESET. Any of DL_PL 1˜6 derivedbased on DL RS or DMRS associated with the same CORESET can be utilizedfor determining or deriving the transmit power P_(PSSCH1)˜P_(PSSCH6) andP_(PSSCH11)˜P_(PSSCH15).

Alternatively, the transmitting device may receive PDCCH 0 and PDCCH 1in the different CORESETs. DL_PL 1˜6 may be derived based on DL RS orDMRS associated with the different CORESETs. Any of DL_PL 1˜6 derivedbased on DL RS or DMRS associated with the different CORESET can beutilized for determining or deriving the transmit powerP_(PSSCH1)˜P_(PSSCH6) and P_(PSSCH11)˜P_(PSSCH15).

Alternatively, the transmitting device may receive PDCCH 0 and PDCCH 1in the different CORESETs. If the transmitting device receives PDCCH 0in CORESET 0, any of DL_PL 1˜6 derived based on DL RS or DMRS associatedwith the CORESET 0 can be utilized for determining or deriving thetransmit power P_(PSSCH1)˜P_(PSSCH6), instead ofP_(PSSCH11)˜P_(PSSCH15). If the transmitting device receives PDCCH 1 inCORESET 1, any of DL_PL 1˜6 derived based on DL RS or DMRS associatedwith the CORESET 1 can be utilized for determining or deriving thetransmit power P_(PSSCH11)˜P_(PSSCH15), instead ofP_(PSSCH1)˜P_(PSSCH6).

-   -   In one embodiment, the transmitting device may derive a DL        pathloss value DL_PL 1 for determining or deriving a transmit        power P_(PSSCH1) of PSSCH 1. Since PSSCH 2 is blind        retransmission of PSSCH 1, the transmit power P_(PSSCH2) of        PSSCH 2 may be set as the same as P_(PSSCH1). In one embodiment,        DL_PL 1 may be derived based on DMRS of PDCCH 0. Alternatively,        DL_PL 1 may be derived based on a DL RS or DMRS associated with        a CORESET, wherein the transmitting device receives PDCCH 0 in        the CORESET. Alternatively, DL_PL 1 may be derived based on a DL        RS or DMRS associated with a specific CORESET.

The transmitting device may receive a HARQ feedback, associated withPSSCH 1 and PSSCH 2, from PSFCH 1. If the HARQ feedback is NACK or DTX,the transmitting device may determine to perform HARQ-based sidelinkretransmission, i.e. PSSCH 3 and PSSCH 4. The transmitting device mayre-determine or re-derive a DL pathloss value DL_PL 2 for determining orderiving the transmit power P_(PSSCH3), and set P_(PSSCH4) as the sameas P_(PSSCH3). In one embodiment, DL_PL 2 may be the last or newest DLpathloss value for PSSCH 3. DL_PL 2 may be derived based on a DL RS orDMRS associated with the CORESET, wherein the transmitting devicereceives the PDCCH 0 in the CORESET. Alternatively, DL_PL 2 may bederived based on a DL RS or DMRS associated with a specific CORESET.

The transmitting device may receive another HARQ feedback, associatedwith the PSSCH 1˜4, from PSFCH 2. If another HARQ feedback is NACK orDTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 5 and PSSCH 6. The transmittingdevice may re-determine or re-derive a DL pathloss value DL_PL 4 fordetermining or deriving the transmit power P_(PSSCH5), and set theP_(PSSCH6) as the same as P_(PSSCH5). In one embodiment, DL_PL 4 may bethe last or newest DL pathloss value for PSSCH 5. DL_PL 4 may be derivedbased on a DL RS or DMRS associated with the CORESET, wherein thetransmitting device receives PDCCH 0 in the CORESET. Alternatively,DL_PL 4 may be derived based on a DL RS or DMRS associated with aspecific CORESET.

The transmitting device may derive a DL pathloss value DL_PL 2 fordetermining or deriving a transmit power P_(PSSCH11) of the PSSCH 11.Since PSSCH 12 is blind retransmission of the PSSCH 11, the transmitpower P_(PSSCH12) of PSSCH 12 may be set as the same as P_(PSSCH11).DL_PL 2 may be derived based on DMRS of the PDCCH 1. Alternatively,DL_PL 2 may be derived based on a DL RS or DMRS associated with aCORESET, wherein the transmitting device receives PDCCH 1 in theCORESET. Alternatively, DL_PL 2 may be derived based on a DL RS or DMRSassociated with a specific CORESET.

The transmitting device may receive a HARQ feedback, associated withPSSCH 11 and PSSCH 12, from PSFCH 11. If the HARQ feedback is NACK orDTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 13 and PSSCH 14. The transmittingdevice may re-determine or re-derive a DL pathloss value DL_PL 3 fordetermining or deriving the transmit power P_(PSSCH13), and setP_(PSSCH14) as the same as P_(PSSCH13). In one embodiment, DL_PL 3 maybe the last or newest DL pathloss value for PSSCH 13. DL_PL 3 may bederived based on a DL RS or DMRS associated with the CORESET, whereinthe transmitting device receives PDCCH 1 in the CORESET. Alternatively,DL_PL 3 may be derived based on a DL RS or DMRS associated with aspecific CORESET.

The transmitting device may receive another HARQ feedback, associatedwith PSSCH 11˜14, from PSFCH 12. If the another HARQ feedback is NACK orDTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 15. The transmitting device mayre-determine or re-derive a DL pathloss value DL_PL 6 for determining orderiving the transmit power P_(PSSCH15). In one embodiment, DL_PL 6 maybe the last or newest DL pathloss value for PSSCH 15. DL_PL 6 may bederived based on a DL RS or DMRS associated with the CORESET, whereinthe transmitting device receives the PDCCH 1 in the CORESET.Alternatively, DL_PL 6 may be derived based on a DL RS or DMRSassociated with a specific CORESET.

Method B

In general, the concept of method B is that a transmitting device mayderive a DL pathloss value for determining an uplink transmit power foran uplink transmission. In one embodiment, the transmitting device mayperform the uplink transmission with the uplink transmit power. Thetransmitting device may utilize the DL pathloss value for determining orderiving sidelink transmit power for a sidelink transmission. In otherwords, the DL pathloss value for determining or deriving sidelinktransmit power may be associated with the DL pathloss value fordetermining an uplink transmit power. In one embodiment, the DL pathlossvalue for determining or deriving sidelink transmit power is set oraligned to the DL pathloss value for determining an uplink transmitpower.

In one embodiment, the uplink transmission may mean a PUSCHtransmission. The uplink transmission may mean a last or most recentPUSCH transmission before the sidelink transmission.

In one embodiment, the uplink transmission may mean a PUCCHtransmission. The uplink transmission may mean a last or most recentPUCCH transmission before the sidelink transmission.

In one embodiment, the uplink transmission may mean a SRS transmission.The uplink transmission may mean a last or most recent SRS transmissionbefore the sidelink transmission.

In one embodiment, the uplink transmission may mean a PRACHtransmission. The uplink transmission may mean a last or most recentPRACH transmission before the sidelink transmission.

In one embodiment, the uplink transmission may mean a last or mostrecent uplink transmission, comprising any of PUSCH, PUCCH, SRS, andPRACH, before the sidelink transmission.

In one embodiment, the transmitting device may be (pre-)configured orspecified with association or alignment between sidelink transmit powerand uplink transmit power of which kind of uplink transmission. Thetransmitting device may be (pre-)configured or specified with a kind ofuplink transmission, wherein DL pathloss value for determining orderiving sidelink transmit power is associated or aligned to DL pathlossvalue for determining uplink transmit power for the kind of uplinktransmission. DL pathloss value for determining or deriving sidelinktransmit power is not associated or not aligned to DL pathloss value fordetermining uplink transmit power for a uplink transmission other thanthe kind of uplink transmission. The kind of uplink transmission maycomprise any of PUSCH, PUCCH, SRS, and PRACH. Alternatively, the kind ofuplink transmission may comprise any of DCI format 0_0-based PUSCH, DCIformat 0_1-based PUSCH, dynamic PUSCH, type-1 configured PUSCH, type-2configured PUSCH, PUCCH format 0˜4, aperiodic SRS, periodic SRS,contention-based PRACH, contention-free PRACH, and/or PDCCH ordertriggered PRACH.

In one embodiment, the DL pathloss value may be calculated by L1-RSRP.Alternatively, the DL pathloss value may be calculated by higher layerfiltered -RSRP. The RSRP may be any of SS-RSRP, CSI-RSRP, or DMRS-RSRP.

In one embodiment, the transmitting device may be configured withnetwork scheduling mode, such as NR mode 1, for sidelink transmission.The transmitting device may be configured with a mixed mode supportingnetwork scheduling mode and/or device self-determination mode, such asNR mode 1 and/or mode 2, for sidelink transmission. Alternatively, thetransmitting device may be configured with device self-determinationmode, such as NR mode 2, for sidelink transmission.

The transmitting device may perform one or multiple sidelinktransmission(s) on one or multiple sidelink resources, such as given bythe grant or selected by the transmitting device. The sidelink transmitpower of the one or multiple sidelink transmission(s) is determined orderived based on the DL pathloss value. A power value derived based onthe DL pathloss value may be an upper bound of sidelink transmit powerof the one or multiple sidelink transmission(s).

FIG. 10 shows multiple possible embodiments. For a sidelink resourcepool, the sidelink resources in time domain may occupy a subset of slotsutilized for sidelink, i.e. sidelink slots. Within a slot, all thesymbols or only a subset of consecutive symbols may be available forsidelink. Moreover, within the sidelink slots associated with theresource pool, PSFCH resources can be (pre)configured periodically witha period of N sidelink slot(s). N is assumed to be 4 in FIG. 10.

The transmitting device may perform UL transmissions in UL symbolsand/or UL slots. The transmitting device may derive DL pathloss valuesfor determining uplink transmit power for the UL transmissions.

The transmitting device may receive a PDCCH 0 delivering or including aSL grant 0, wherein the SL grant 0 may indicate resources of PSSCH 1˜6.Note that PSSCH 1˜6 may be in different SL slots. PSSCH 1˜6 may be indifferent frequency resources. PSSCH 1˜6 may be with the same size ofoccupied subchannel(s), but with different starting subchannel index. Inone embodiment, PSSCH 1˜6 may carry a first same TB.

The transmitting device may receive a PDCCH 1 delivering or including aSL grant 1, wherein the SL grant 1 may indicate resources of PSSCH11˜15. PSSCH 11˜15 may be in different frequency resources. PSSCH 11˜15may be with the same size of occupied subchannel(s), but with differentstarting subchannel index. In one embodiment, PSSCH 11˜15 may carry asecond same TB.

-   -   In one embodiment, the transmitting device may derive a DL        pathloss value DL_PL 1 for determining or deriving a transmit        power P_(PSSCH1) of the PSSCH 1. The transmit power        P_(PSSCH2)˜P_(PSSCH6) of the PSSCH 2˜6 is set as the same as        P_(PSSCH1). In one embodiment, DL_PL 1 may be associated,        aligned, or set to a downlink pathloss value for determining        uplink transmit power for UL TX 1. UL TX 1 may be the last or        most recent UL transmission before PSSCH 1.

Moreover, the transmitting device may derive a DL pathloss value DL_PL 2for determining or deriving a transmit power P_(PSSCH11) of PSSCH 11.The transmit power P_(PSSCH12)˜P_(PSSCH15) of PSSCH 12˜15 is set as thesame as P_(PSSCH11). In one embodiment, DL_PL 2 may be associated,aligned, or set to a downlink pathloss value for determining uplinktransmit power for UL TX 2. UL TX 2 may be the last or most recent ULtransmission before PSSCH 11.

In one embodiment, the transmit power P_(PSSCH1) and the transmit powerP_(PSSCH11) may be determined or derived respectively. The transmitpower P_(PSSCH1) may be different from the transmit power P_(PSSCH11).

-   -   In one embodiment, the transmitting device may derive DL        pathloss value separately for each of PSSCH 1˜6. The        transmitting device may determine or derive the sidelink        transmit power of PSSCH based on the last or newest DL pathloss        value, which is utilized for determining the sidelink transmit        power. As shown in the instance, the transmitting device may        derive a DL pathloss value DL_PL 1 before PSSCH 1, and utilize        DL_PL 1 for determining or deriving a transmit power P_(PSSCH1)        of PSSCH 1. UL TX 1 may be the last or most recent UL        transmission before PSSCH 1.

Since the transmitting device may not derive another new DL pathlossvalue before PSSCH 2, the transmitting device may utilize DL_PL 1 fordetermining or deriving a transmit power P_(PSSCH2) of PSSCH 2. When thetransmitting device derives a DL pathloss value DL_PL 2, thetransmitting device utilizes DL_PL 2 for determining or deriving atransmit power P_(PSSCH3) and the transmit power P_(PSSCH11),P_(PSSCH12). UL TX 2 may be the last or most recent UL transmissionbefore PSSCH 3, PSSCH 11, and PSSCH 12.

When the transmitting device derives a DL pathloss value DL_PL 3, thetransmitting device may utilize DL_PL 3 for determining or deriving atransmit power P_(PSSCH4) and the transmit power P_(PSSCH13) since DL_PL3 is the last or newest DL pathloss value for PSSCH 4 and PSSCH 13.

When the transmitting device derives a DL pathloss value DL_PL 4, thetransmitting device may utilize DL_PL 4 for determining or deriving atransmit power P_(PSSCH5) and the transmit power P_(PSSCH14) since DL_PL4 is the last or newest DL pathloss value for PSSCH 5 and PSSCH 14.

When the transmitting device derives a DL pathloss value DL_PL 5, thetransmitting device may utilize DL_PL 5 for determining or deriving atransmit power P_(PSSCH6) since DL_PL 5 is the last or newest DLpathloss value for PSSCH 6.

When the transmitting device derives a DL pathloss value DL_PL 6, thetransmitting device may utilize DL_PL 6 for determining or deriving atransmit power P_(PSSCH15) since DL_PL 6 is the last or newest DLpathloss value for PSSCH 15.

In one embodiment, DL_PL 1˜6 may be associated, aligned, or set todownlink pathloss value for determining uplink transmit power for UL TX1˜6 respectively.

-   -   In one embodiment, the transmitting device may derive a DL        pathloss value DL_PL 1 for determining or deriving a transmit        power P_(PSSCH1) of PSSCH 1. Since PSSCH 2 is blind        retransmission of the PSSCH 1, the transmit power P_(PSSCH2) of        PSSCH 2 may be set to be the same as P_(PSSCH1). In one        embodiment, the DL_PL 1 may be associated, aligned, or set to        downlink pathloss value for determining uplink transmit power        for UL TX 1. The UL TX 1 may be the last or most recent UL        transmission before the PSSCH 1.

The transmitting device may receive a HARQ feedback, associated with thePSSCH 1 and the PSSCH 2, from PSFCH 1. If the HARQ feedback is NACK orDTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 3 and PSSCH 4. The transmittingdevice may re-determine or re-derive a DL pathloss value DL_PL 2 fordetermining or deriving the transmit power P_(PSSCH3), and set theP_(PSSCH4) as the same as P_(PSSCH3). The DL_PL 2 may be associated,aligned, or set to downlink pathloss value for determining uplinktransmit power for UL TX 2 since UL TX 2 is the last or most recent ULtransmission before the PSSCH 3.

The transmitting device may receive another HARQ feedback, associatedwith the PSSCH 1˜4, from PSFCH 2. If the another HARQ feedback is NACKor DTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 5 and PSSCH 6. The transmittingdevice may re-determine or re-derive a DL pathloss value DL_PL 4 fordetermining or deriving the transmit power P_(PSSCH5), and setP_(PSSCH6) as the same as P_(PSSCH5). In one embodiment, DL_PL 4 may beassociated, aligned, or set to downlink pathloss value for determininguplink transmit power for UL TX 4, since the UL TX 4 is the last or mostrecent UL transmission before the PSSCH 5.

The transmitting device may derive a DL pathloss value DL_PL 2 fordetermining or deriving a transmit power P_(PSSCH11) of PSSCH 11. SincePSSCH 12 is blind retransmission of PSSCH 11, the transmit powerP_(PSSCH12) of PSSCH 12 is set as the same as P_(PSSCH11). In oneembodiment, DL_PL 2 may be associated, aligned, or set to downlinkpathloss value for determining uplink transmit power for UL TX 2, sinceUL TX 2 is the last or most recent UL transmission before PSSCH 11.

The transmitting device may receive a HARQ feedback, associated withPSSCH 11 and PSSCH 12, from PSFCH 11. If the HARQ feedback is NACK orDTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 13 and PSSCH 14. The transmittingdevice may re-determine or re-derive a DL pathloss value DL_PL 3 fordetermining or deriving the transmit power P_(PSSCH13), and setP_(PSSCH14) as the same as P_(PSSCH13). In one embodiment, DL_PL 3 maybe associated, aligned, or set to downlink pathloss value fordetermining uplink transmit power for UL TX 3, since UL TX 3 is the lastor most recent UL transmission before PSSCH 13.

The transmitting device may receive another HARQ feedback, associatedwith PSSCH 11˜14, from PSFCH 12. If the another HARQ feedback is NACK orDTX, the transmitting device may determine to perform HARQ-basedsidelink retransmission, i.e. PSSCH 15. The transmitting device mayre-determine or re-derive a DL pathloss value DL_PL 6 for determining orderiving the transmit power P_(PSSCH15). In one embodiment, DL_PL 6 maybe the last or newest DL pathloss value for PSSCH 15 since DL_PL 6 isassociated, aligned, or set to downlink pathloss value for determininguplink transmit power for UL TX 6.

Method C

The general concept of method C is that a transmitting device may beconfigured with one or multiple set of DL RS(s) for deriving DL pathlossvalue for determining/deriving sidelink transmit power. In oneembodiment, the transmitting device may derive one or multiple DLpathloss values based on the one or multiple set of DL RS(s).

In one embodiment, each DL pathloss value may be derived based onreception or measurement on one set of DL RS(s) respectively.Furthermore, each DL pathloss value may be associated to one set of DLRS(s). The DL pathloss value may be calculated by higher layer filtered-RSRP. Alternatively, the DL pathloss value may be calculated byL1-RSRP.

In one embodiment, each DL pathloss value may be derived based onreception or measurement in one DL RS occasion, such as within one TTI,of one set of DL RS(s) respectively. Each DL pathloss value may beassociated to one DL RS occasion, such as within one TTI, of one set ofDL RS(s). The DL pathloss value may be calculated by L1-RSRP.

In one embodiment, the transmitting device may select or derive aspecific DL pathloss value from the one or multiple DL pathloss valuesand utilize the specific DL pathloss value for determining or derivingsidelink transmit power.

In one embodiment, the specific DL pathloss value may be the smallest DLpathloss value among the one or multiple DL pathloss values.Furthermore, the specific DL pathloss value may be an average valuederived from the one or multiple DL pathloss values.

In one embodiment, the specific DL pathloss value may be an averagevalue derived from some of the one or multiple DL pathloss values. Forinstance, number of the some of the one or multiple DL pathloss valuesmay be (around) X % of the number of the one or multiple DL pathlossvalues. X may be a (pre-)configured or specified value. Some of the oneor multiple DL pathloss values may be smaller than others of the one ormultiple DL pathloss values.

In one embodiment, the specific DL pathloss value may be aweighted-average value derived from the one or multiple DL pathlossvalues. A later DL pathloss value may be with higher weighting than anearly DL pathloss value. A DL pathloss value derived in time occasion mmay be with higher weighting than a DL pathloss value in time occasionm-c, wherein m is non-negative integer and c is positive integer. A DLpathloss value calculated by a type of RSRP value (such as SS-RSRP,CSI-RSRP, DMRS-RSRP, or such as L1-RSRP, higher layer filtered -RSRP)may be with higher weighting than a DL pathloss value calculated byanother type of RSRP value. The weighting may be different for DLpathloss value calculated by different types of RSRP value (such asSS-RSRP, CSI-RSRP, DMRS-RSRP, or such as L1-RSRP, higher layer filtered-RSRP).

In one embodiment, for determining or deriving sidelink transmit powerof a sidelink transmission, the transmitting device may select or derivethe specific DL pathloss value based on the one or multiple DL pathlossvalues (or the one or multiple RSRP values), wherein the one or multipleDL pathloss values (or the one or multiple RSRP values) may be derivedwithin a pathloss duration. The motivation of the pathloss durationcould be to ensure the one or multiple DL pathloss values (or the one ormultiple RSRP values) are valid for determining or deriving sidelinktransmit power of the sidelink transmission, since an out-of-date DLpathloss cannot reflect the actual propagation pathloss between networknode and the transmitting device. The time length of the pathlossduration may be (pre-)configured or specified. Moreover, if thetransmitting device is with higher mobility (i.e. move with highervelocity or speed), the time length of the pathloss duration may beshorter, and vice versa.

-   -   In one embodiment, the pathloss duration may be associated with        time occasion (such as a TTI) of the sidelink transmission. It        could mean that if the transmitting device performs the sidelink        transmission in a TTI n, the transmitting device may derive the        specific DL pathloss based on DL RS reception or measurement        within associated pathloss duration, such as the time duration        between TTI n-b and TTI n-a, wherein both a and b are        non-negative intergers and b>a. In one embodiment, a is        determined based on processing capability of the device. (value        of) a and/or b could be (pre-)configured. The device could        derive a and/or b based on mobility of the device.

For instance as shown in FIG. 11, the transmitting device may beconfigured with 4 set of DL RS(s), i.e. DL RS 1˜4. Each of the set of DLRS 1˜4 may be configured with respective periodicity and/or offset forderiving the DL RS transmission timing pattern. Each of the set of DL RS1˜4 may also be configured with different periodicities and/or offsets.Furthermore, each of the set of DL RS 1˜4 may be configured withdifferent frequency resources. In addition, each of the set of DL RS 1˜4may be configured as different types of DL RS.

When the transmitting device is going to transmit PSSCH 1, thetransmitting device may derive a DL pathloss value, DL_PL1, based on DLRS reception or measurement within associated PathLoss (PL) duration forPSSCH 1. In one embodiment, the transmitting device may select or deriveone specific DL pathloss value, DL_PL1, based on the one or multiple DLpathloss values (or the one or multiple RSRP values), which are derivedbased on DL RS reception or measurement within associated PL durationfor PSSCH 1. The transmitting device may receive or measure any of DL RStransmissions belonging to the set of DL RS 1˜4 within associated PLduration for PSSCH 1. The transmitting device may utilize the DL_PL1value for determining or deriving sidelink transmit power of PSSCH 1.

When the transmitting device is going to transmit PSSCH 2, thetransmitting device may derive a DL pathloss value, DL_PL2, based on DLRS reception or measurement within associated PL duration for PSSCH 2.In one embodiment, the transmitting device may select or derive onespecific DL pathloss value, DL_PL2, based on the one or multiple DLpathloss values (or the one or multiple RSRP values), which are derivedbased on DL RS reception or measurement within associated PL durationfor PSSCH 2. The transmitting device may receive or measure any of DL RStransmissions belonging to the set of DL RS 1˜4 within associated PLduration for PSSCH 2. The transmitting device may utilize DL_PL 2 valuefor determining or deriving sidelink transmit power of PSSCH 2.

When the transmitting device is going to transmit PSFCH 12 in responseof receiving PSSCH 12, the transmitting device may derive a DL pathlossvalue, DL_PL3, based on DL RS reception or measurement within associatedPL duration for PSFCH 12. In one embodiment, the transmitting device mayselect or derive one specific DL pathloss value, DL_PL3, based on theone or multiple DL pathloss values (or the one or multiple RSRP values),which are derived based on DL RS reception or measurement withinassociated PL duration for PSFCH 12. The transmitting device may receiveor measure any of DL RS transmissions belonging to the set of DL RS 1˜4within associated PL duration for PSFCH 12. The transmitting device mayutilize the DL_PL 3 value for determining or deriving sidelink transmitpower of PSFCH 12.

-   -   In one embodiment, the pathloss duration may be (pre-)configured        or specified. In one embodiment, the pathloss duration may be        (pre-)configured or specified with a periodicity and/or an        offset for deriving time pattern of the pathloss duration. The        transmitting device may select or derive one specific DL        pathloss value associated with one pathloss duration. It could        mean that if the transmitting device performs the sidelink        transmission in a TTI n, wherein the TTI n is within a pathloss        duration N+1, the transmitting device may utilize a specific DL        pathloss value associated with previous pathloss duration, such        as pathloss duration N, for determining or deriving sidelink        transmit power.

For instance as shown in FIG. 12, the transmitting device may beconfigured with 4 set of DL RS(s), i.e. DL RS 1˜4. Each of the set of DLRS 1˜4 may be configured with respective periodicity and/or offset forderiving the DL RS transmission timing pattern. Furthermore, each of theset of DL RS 1˜4 may be configured with different periodicities and/oroffsets. In addition, each of the set of DL RS 1˜4 may be configuredwith different frequency resources. Each of the set of DL RS 1˜4 mayalso be configured as different types of DL RS.

In one embodiment, the transmitting device may derive a DL pathlossvalue, DL_PL N, based on DL RS reception or measurement within PLduration N. The transmitting device may derive a DL pathloss value,DL_PL (N+1), based on DL RS reception or measurement within PL durationN+1. In one embodiment, the transmitting device may select or derive onespecific DL pathloss value, DL_PL N, based on the one or multiple DLpathloss values (or the one or multiple RSRP values), which are derivedbased on DL RS reception or measurement within PL duration N.

The transmitting device may select or derive one specific DL pathlossvalue, DL_PL (N+1), based on the one or multiple DL pathloss values (orthe one or multiple RSRP values), which are derived based on DL RSreception or measurement within PL duration N+1. The transmitting devicemay receive or measure any of DL RS transmissions belonging to the setof DL RS 1˜4 within PL duration N. The transmitting device may alsoreceive or measure any of DL RS transmissions belonging to the set of DLRS 1˜4 within PL duration N+1.

When the transmitting device is going to transmit PSSCH 2, thetransmitting device may utilize the DL_PL N value for determining orderiving sidelink transmit power of PSSCH 2. When the transmittingdevice is going to transmit PSSCH 3, the transmitting device may utilizethe DL_PL N value for determining or deriving sidelink transmit power ofPSSCH 3. When the transmitting device is going to transmit PSFCH 12 inresponse of receiving PSSCH 12, the transmitting device may utilize theDL_PL N value for determining or deriving sidelink transmit power ofPSFCH 12.

When the transmitting device is going to transmit PSSCH 1, thetransmitting device may derive a DL pathloss value, DL_PL (N−1), basedon DL RS reception or measurement within PL duration N−1. Thetransmitting device may select or derive one specific DL pathloss value,DL_PL (N−1), based on the one or multiple DL pathloss values (or the oneor multiple RSRP values), which are derived based on DL RS reception ormeasurement within PL duration N−1. The transmitting device may utilizethe DL_PL (N−1) value for determining or deriving sidelink transmitpower of PSSCH 1. The transmitting device may utilize the DL_PL (N−1)value for determining or deriving sidelink transmit power of PSFCH 11 inresponse of receiving PSSCH 11.

In one embodiment, the transmitting device may be in cell coverage of anetwork node.

-   -   In one embodiment, the transmitting device may be in        RRC-connected mode in Uu interface. The transmitting device may        be configured with network scheduling mode, such as NR mode 1,        for sidelink transmission. The transmitting device may be        operated or configured with device self-determination mode, such        as NR mode 2, for sidelink transmission. The transmitting device        may be configured with a mixed mode supporting network        scheduling mode and/or device self-determination mode, such as        NR mode 1 and/or mode 2, for sidelink transmission.

In one embodiment, the transmitting device may receive a configurationfrom network node, wherein the configuration indicates the one ormultiple set of DL RS(s) for deriving DL pathloss value for determiningor deriving sidelink transmit power. The configuration may be a dedicateconfiguration for the transmitting device. The configuration may be acommon configuration for the devices supporting sidelink communication.The configuration may be delivered or included in system information(for sidelink communication) or device-specific downlink datatransmission.

In one embodiment, the transmitting device may be configured with one ormultiple CORESETs for monitoring downlink control transmissions, whereineach CORESET may be associated with one set of DL RS(s). Thetransmitting device may derive one or multiple DL pathloss values (orthe one or multiple RSRP values) based on the one or multiple set of DLRS(s) associated with the one or multiple CORESETs. In one embodiment,the CORESET configuration may be a dedicate configuration for thetransmitting device. The CORESET configuration may also be a commonconfiguration for the devices supporting sidelink communication. TheCORESET configuration may be delivered or included in system information(for sidelink communication) or device-specific downlink datatransmission.

-   -   In one embodiment, the transmitting device is in RRC-idle mode        in Uu link. The transmitting device may be operated in device        self-determination mode, such as NR mode 2, for sidelink        transmission.

In one embodiment, the transmitting device may receive a configurationfrom network node, wherein the configuration indicates the one ormultiple set of DL RS(s) for deriving DL pathloss value for determiningor deriving sidelink transmit power. The configuration may be a commonconfiguration for the devices supporting sidelink communication. Theconfiguration may be delivered or included in system information (forsidelink communication).

In one embodiment, the transmitting device may be configured with one ormultiple CORESETs for monitoring downlink control transmissions, whereineach CORESET may be associated with one set of DL RS(s). Thetransmitting device may monitor or receive the downlink controltransmission for acquiring system information for sidelinkcommunication. The transmitting device may derive one or multiple DLpathloss values (or the one or multiple RSRP values) based on the one ormultiple set of DL RS(s) associated with the one or multiple CORESETs.The CORESET configuration may be a common configuration for the devicessupporting sidelink communication. The CORESET configuration may bedelivered or included in system information (for sidelinkcommunication).

The DL RS may mean a SS or PBCH block or a CSI-RS. The DL RS associatedwith a CORESET may be SS/PBCH block, CSI-RS, or DMRS. In one embodiment,the DMRS may be utilized for demodulation of the DL control transmissionin the CORESET. The RSRP may be any of SS-RSRP, CSI-RSRP, or DMRS-RSRP.

In one embodiment, the configuration of the one or multiple set of DLRS(s) may be different for a device configured with network schedulingmode, such as NR mode 1, and a device configured with deviceself-determination mode, such as NR mode 2. The configuration of the oneor multiple set of DL RS(s) may be irrelevant to whether a device isconfigured with either or both of network scheduling mode and withdevice self-determination mode.

In one embodiment, the transmitting device configured with deviceself-determination mode, such as NR mode 2, may receive a configurationfrom network node, wherein the configuration indicates the one ormultiple set of DL RS(s) for deriving DL pathloss value for determiningor deriving sidelink transmit power. The transmitting device configuredwith network scheduling mode, such as NR mode 1, may be configured withone or multiple CORESETs for monitoring downlink control transmissionsand/or sidelink grant, wherein each CORESET may be associated with oneset of DL RS(s). The transmitting device configured with networkscheduling mode may derive one or multiple DL pathloss (or the one ormultiple RSRP values) values based on the one or multiple set of DLRS(s) associated with the one or multiple CORESETs.

In one embodiment, the transmitting device configured with networkscheduling mode, such as NR mode 1, may receive a configuration fromnetwork node, wherein the configuration indicates the one or multipleset of DL RS(s) for deriving DL pathloss value for determining orderiving sidelink transmit power. The transmitting device configuredwith device self-determination mode, such as NR mode 2, may beconfigured with one or multiple CORESETs for monitoring downlink controltransmissions, wherein each CORESET may be associated with one set of DLRS(s). The transmitting device configured with network scheduling modemay derive one or multiple DL pathloss values (or the one or multipleRSRP values) based on the one or multiple set of DL RS(s) associatedwith the one or multiple CORESETs.

In one embodiment, the configuration of the one or multiple set of DLRS(s) delivered or included in system information (for sidelinkcommunication) may be different from the configuration of the one ormultiple set of DL RS(s) delivered or included in device-specificdownlink data transmission. The transmitting device may perform one ormultiple sidelink transmission(s), wherein the sidelink transmit powerof the one or multiple sidelink transmission(s) may be determined orderived based on the specific DL pathloss value. A power value derivedbased on the specific DL pathloss value may be an upper bound ofsidelink transmit power of the one or multiple sidelink transmission(s).

In one embodiment, if the transmitting device does not receive ormeasure a DL RS occasion of one or multiple set of DL RS(s), thetransmitting device may not take the DL RS occasion into considerationfor DL pathloss derivation. The transmitting device may skipreception/measurement of a DL RS occasion because of any of possiblereasons comprising DL bandwidth switch, SL reception or monitoring,and/or SFI indicating the DL RS occasion as non-DL.

Method D

The general concept of method D is that in one embodiment, atransmitting device may derive one or multiple DL pathloss values basedon one or multiple SS or PBCH blocks with different indexes.

In one embodiment, each DL pathloss value may be derived respectivelybased on SS/PBCH block with one SS or PBCH block index. Each DL pathlossvalue may be derived respectively based on RS resource obtained from SSor PBCH block with one SS or PBCH block index. Each DL pathloss valuemay be associated to one SS or PBCH block index. The DL pathloss valuemay be calculated by higher layer filtered -RSRP. Alternatively, the DLpathloss value may be calculated by L1-RSRP.

In one embodiment, the transmitting device may select or derive aspecific DL pathloss value from the one or multiple DL pathloss valuesand utilize the specific DL pathloss value for determining or derivingsidelink transmit power. The specific DL pathloss value may be thesmallest DL pathloss value among the one or multiple DL pathloss values.The specific DL pathloss value may be an average value derived from theone or multiple DL pathloss values.

In one embodiment, the specific DL pathloss value may be an averagevalue derived from some of the one or multiple DL pathloss values. Forinstance, number of the some of the one or multiple DL pathloss valuesmay be (around) X % of the number of the one or multiple DL pathlossvalues. X may be a (pre-)configured or specified value. Some of the oneor multiple DL pathloss values may be smaller than others of the one ormultiple DL pathloss values.

In one embodiment, the specific DL pathloss value may be aweighted-average value derived from the one or multiple DL pathlossvalues. A later DL pathloss value may be with higher weighting than anearly DL pathloss value. A DL pathloss value derived in time occasion mmay be with higher weighting than a DL pathloss value in time occasionm-c, wherein m is non-negative integer and c is positive integer. A DLpathloss value calculated by a type of RSRP value (such as L1-RSRP,higher layer filtered -RSRP) may be with higher weighting than a DLpathloss value calculated by another type of RSRP value. A DL pathlossvalue calculated by a RSRP value based on SS or PBCH block, from thatthe transmitting device obtains MIB or SIB, may be with higher weightingthan a DL pathloss value calculated by a RSRP value based on SS or PBCHblock, from that the transmitting device does not obtain MIB or SIB.

In one embodiment a transmitting device may derive one or multiple RSRPvalues based on one or multiple SS or PBCH blocks with differentindexes. Each RSRP value may be derived respectively based on SS or PBCHblock with one SS or PBCH block index. Each RSRP value may be derivedrespectively based on RS resource obtained from SS or PBCH block withone SS or PBCH block index. Each RSRP value may be associated to one SSor PBCH block index. The RSRP may be higher layer filtered -RSRP.Preferably or alternatively, the RSRP may be L1-RSRP.

In one embodiment, the transmitting device may select or derive aspecific DL pathloss value from the one or multiple RSRP values andutilize the specific DL pathloss value for determining or derivingsidelink transmit power. The specific DL pathloss value may be derivedbased on the smallest RSRP value among the one or multiple RSRP values.The specific DL pathloss value may be derived based on an average RSRPvalue derived from the one or multiple RSRP values.

In one embodiment, the specific DL pathloss value may be derived basedon an average RSRP value derived from some of the one or multiple RSRPvalues. For instance, number of the some of the one or multiple RSRPvalues may be (around) X % of the number of the one or multiple RSRPvalues. X may be a (pre-)configured or specified value. Some of the oneor multiple RSRP values may be smaller than others of the one ormultiple RSRP values.

In one embodiment, the specific DL pathloss value may be derived basedon a weighted-average RSRP value derived from the one or multiple RSRPvalues. A later RSRP value may be with higher weighting than an earlyRSRP value. A RSRP value derived in time occasion m may be with higherweighting than a RSRP value in time occasion m-c, wherein m isnon-negative integer and c is positive integer. A type of RSRP value(such as L1-RSRP, higher layer filtered -RSRP) may be with higherweighting than another type of RSRP value. A RSRP value based on SS orPBCH block, from that the transmitting device obtains MIB or SIB, may bewith higher weighting than a RSRP value based on SS or PBCH block, fromthat the transmitting device does not obtain MIB or SIB.

In one embodiment, the transmitting device may not know which SS or PBCHblock resources the network really transmits SS or PBCH block, i.e.actual SS or PBCH blocks. For instance, the transmitting device is inRRC-idle mode in Uu interface or the transmitting device does notreceive configuration of SS or PBCH block. The transmitting device mayreceive or measure each candidate SS or PBCH block. The transmittingdevice may derive DL pathloss value based on one or multiple candidateSS or PBCH blocks.

Alternatively, to avoid error measurement, the transmitting device mayderive DL pathloss value based on one or multiple SS or PBCH blocks thatthe transmitting device can obtain MIB. The transmitting device mayderive DL pathloss value based on RS resources obtained from one ormultiple SS or PBCH blocks that the transmitting device can obtain MIB.More specifically, the MIB may be delivered or included in PBCH.

Alternatively, the transmitting device may derive DL pathloss valuebased on one or multiple SS or PBCH blocks that the transmitting devicecan obtain system information for sidelink communication. In oneembodiment, the transmitting device may derive DL pathloss value basedon RS resources obtained from one or multiple SS or PBCH blocks that thetransmitting device can obtain system information for sidelinkcommunication. More specifically, the SS or PBCH blocks that thetransmitting device can obtain system information for sidelinkcommunication could mean that the SS or PBCH blocks associated withreception, monitoring, or detection of a downlink control transmission,which scheduling a DL data transmission delivering the systeminformation for sidelink communication.

In one embodiment, for determining or deriving sidelink transmit powerof a sidelink transmission, the transmitting device may select or derivethe specific DL pathloss value based on the one or multiple DL pathlossvalues (or the one or multiple RSRP values), wherein the one or multipleDL pathloss values (or the one or multiple RSRP values) may be derivedwithin a pathloss duration. The motivation of the pathloss durationcould be to ensure the one or multiple DL pathloss values (or the one ormultiple RSRP values) are valid for determining or deriving sidelinktransmit power of the sidelink transmission, since an out-of-date DLpathloss cannot reflect the actual propagation pathloss between networknode and the transmitting device. The time length of the pathlossduration may be (pre-)configured or specified. Moreover, if thetransmitting device is with higher mobility (i.e. move with highervelocity or speed), the time length of the pathloss duration may beshorter, and vice versa.

-   -   In one embodiment, the pathloss duration may be associated with        time occasion of the sidelink transmission. It could mean that        if the transmitting device performs the sidelink transmission in        a TTI n, the transmitting device may derive the specific DL        pathloss based on reception or measurement of one or multiple SS        or PBCH blocks within associated pathloss duration, such as the        time duration between TTI n-b and TTI n-a, wherein both a and b        are non-negative integers and b>a. a could be determined based        on processing capability of the device. (value of) a and/or b        could be (pre-)configured. The device may derive a and/or b        based on mobility of the device.

For instance as shown in FIG. 13, the transmitting device may derive DLpathloss value based on (RS resources obtained from) SS or PBCH blockswith index 1˜4, noted as SSB 1˜4. In one embodiment, the transmittingdevice can obtain MIB from any of SS or PBCH blocks with index 1˜4.

When the transmitting device is going to transmit PSSCH 1, thetransmitting device may derive a DL pathloss value, DL_PL1, based onreception or measurement of SSB 1˜4 within associated PathLoss (PL)duration for PSSCH 1. In one embodiment, the transmitting device mayselect or derive one specific DL pathloss value, DL_PL1, based on theone or multiple DL pathloss values (or the one or multiple RSRP values),which are derived based on reception or measurement of SSB 1˜4 withinassociated PL duration for PSSCH 1. The transmitting device may receiveor measure any of SSB transmission belonging to SSB 1˜4 withinassociated PL duration for PSSCH 1. The transmitting device may utilizethe DL_PL1 value for determining or deriving sidelink transmit power ofPSSCH 1.

When the transmitting device is going to transmit PSSCH 2, thetransmitting device may derive a DL pathloss value, DL_PL2, based onreception or measurement of SSB 1˜4 within associated PL duration forPSSCH 2. In one embodiment, the transmitting device may select or deriveone specific DL pathloss value, DL_PL2, based on the one or multiple DLpathloss values (or the one or multiple RSRP values), which are derivedbased on reception or measurement of SSB 1˜4 within associated PLduration for PSSCH 2. The transmitting device may receive or measure anyof SSB transmission belonging to SSB 1˜4 within associated PL durationfor PSSCH 2. The transmitting device may utilize the DL_PL 2 value fordetermining or deriving sidelink transmit power of PSSCH 2.

When the transmitting device is going to transmit PSFCH 12 in responseof receiving PSSCH 12, the transmitting device may derive a DL pathlossvalue, DL_PL3, based on reception/measurement of SSB 1˜4 withinassociated PL duration for PSFCH 12. The transmitting device may selector derive one specific DL pathloss value, DL_PL3, based on the one ormultiple DL pathloss values (or the one or multiple RSRP values), whichare derived based on reception or measurement of SSB 1˜4 withinassociated PL duration for PSFCH 12. The transmitting device may receiveor measure any of SSB transmissions belonging to SSB 1˜4 withinassociated PL duration for PSFCH 12. The transmitting device may utilizethe DL_PL 3 value for determining or deriving sidelink transmit power ofPSFCH 12.

-   -   In one embodiment, the pathloss duration may be (pre-)configured        or specified. Preferably, the pathloss duration may be        configured with a periodicity and/or an offset for deriving time        pattern of the pathloss duration. The transmitting device may        select or derive one specific DL pathloss value associated with        one pathloss duration. It could mean that if the transmitting        device performs the sidelink transmission in a TTI n, wherein        the TTI n is within a pathloss duration N+1, the transmitting        device may utilize a specific DL pathloss value associated with        previous pathloss duration, such as pathloss duration N, for        determining or deriving sidelink transmit power.

For instance as shown in FIG. 14, the transmitting device may derive DLpathloss value based on (RS resources obtained from) SS or PBCH blockswith index 1˜4, noted as SSB 1˜4. In one embodiment, the transmittingdevice can obtain MIB from any of SS or PBCH blocks with index 1˜4.

In one embodiment, the transmitting device may derive a DL pathlossvalue, DL_PL N, based on reception or measurement of SSB 1˜4 within PLduration N. The transmitting device may derive a DL pathloss value,DL_PL (N+1), based on reception or measurement of SSB 1˜4 within PLduration N+1. The transmitting device may select or derive one specificDL pathloss value, DL_PL N, based on the one or multiple DL pathlossvalues (or the one or multiple RSRP values), which are derived based onreception or measurement of SSB 1˜4 within PL duration N. Thetransmitting device may select or derive one specific DL pathloss value,DL_PL (N+1), based on the one or multiple DL pathloss values (or the oneor multiple RSRP values), which are derived based on reception ormeasurement of SSB 1˜4 within PL duration N+1.

In one embodiment, the transmitting device may receive or measure any ofSSB transmissions belonging to SSB 1˜4 within PL duration N. Thetransmitting device may receive or measure any of SSB transmissionsbelonging to the set of SSB 1˜4 within PL duration N+1.

When the transmitting device is going to transmit PSSCH 2, thetransmitting device may utilize the DL_PL N value for determining orderiving sidelink transmit power of PSSCH 2. When the transmittingdevice is going to transmit PSSCH 3, the transmitting device may utilizethe DL_PL N value for determining or deriving sidelink transmit power ofPSSCH 3. When the transmitting device is going to transmit PSFCH 12 inresponse of receiving PSSCH 12, the transmitting device may utilize theDL_PL N value for determining or deriving sidelink transmit power ofPSFCH 12.

When the transmitting device is going to transmit PSSCH 1, thetransmitting device may derive a DL pathloss value, DL_PL (N−1), basedon reception or measurement of SSB 1˜4 within PL duration N−1. In oneembodiment, the transmitting device may select or derive one specific DLpathloss value, DL_PL (N−1), based on the one or multiple DL pathlossvalues (or the one or multiple RSRP values), which are derived based onreception or measurement of SSB 1˜4 within PL duration N−1. Thetransmitting device may utilize the DL_PL (N−1) value for determining orderiving sidelink transmit power of PSSCH 1. The transmitting device mayutilize the DL_PL (N−1) value for determining or deriving sidelinktransmit power of PSFCH 11 in response of receiving PSSCH 11.

In one embodiment, the transmitting device may be in cell coverage of anetwork node.

-   -   In one embodiment, the transmitting device may be in        RRC-connected mode in Uu interface. The transmitting device may        be configured with network scheduling mode, such as NR mode 1,        for sidelink transmission. The transmitting device may be        operated or configured with device self-determination mode, such        as NR mode 2, for sidelink transmission. The transmitting device        may be configured with a mixed mode supporting network        scheduling mode and/or device self-determination mode, such as        NR mode 1 and/or mode 2, for sidelink transmission.

In one embodiment, the transmitting device may receive a configurationfrom network node, wherein the configuration indicates actual SS or PBCHblocks for deriving DL pathloss value for determining or derivingsidelink transmit power. The configuration may be a dedicateconfiguration for the transmitting device. The configuration may be acommon configuration for the devices supporting sidelink communication.The configuration may be delivered or included in system information(for sidelink communication) or device-specific downlink datatransmission.

-   -   In one embodiment, the transmitting device is in RRC-idle mode        in Uu link. The transmitting device may be operated in device        self-determination mode, such as NR mode 2, for sidelink        transmission.

In one embodiment, the transmitting device may receive a configurationfrom network node, wherein the configuration indicates actual SS or PBCHblocks for deriving DL pathloss value for determining or derivingsidelink transmit power. The configuration may be a common configurationfor the devices supporting sidelink communication. The configuration maybe delivered or included in system information (for sidelinkcommunication).

In one embodiment, the configuration of actual SS or PBCH blocks may bedifferent for a device configured with network scheduling mode, such asNR mode 1, and a device configured with device self-determination mode,such as NR mode 2. The RSRP may be SS-RSRP. The configuration of actualSS or PBCH blocks may be irrelevant to whether a device is configuredwith either or both of network scheduling mode and with deviceself-determination mode.

In one embodiment, the transmitting device configured with deviceself-determination mode, such as NR mode 2, may receive a configurationfrom network node, wherein the configuration indicates actual SS or PBCHblocks for deriving DL pathloss value for determining or derivingsidelink transmit power. The transmitting device configured with networkscheduling mode, such as NR mode 1, may receive a configuration fromnetwork node, wherein the configuration indicates actual SS or PBCHblocks for deriving DL pathloss value for determining or derivingsidelink transmit power.

In one embodiment, the transmitting device may perform one or multiplesidelink transmission(s), wherein the sidelink transmit power of the oneor multiple sidelink transmission(s) may be determined or derived basedon the specific DL pathloss value. A power value derived based on thespecific DL pathloss value may be an upper bound of sidelink transmitpower of the one or multiple sidelink transmission(s).

In one embodiment, if the transmitting device does not receive ormeasure a SSB occasion of the one or multiple SS or PBCH blocks, thetransmitting device may not take the SSB occasion into consideration forDL pathloss derivation. If the transmitting device does not receive MIB(successfully) from a SSB occasion of the one or multiple SS or PBCHblocks, the transmitting device may not take the SSB occasion inconsideration for DL pathloss derivation. The transmitting device mayskip reception or measurement of a SSB occasion because of any ofpossible reasons comprising DL bandwidth switch, SL reception ormonitoring.

For Method C and/or Method D:

In one embodiment, the transmitting device may perform one or multiplesidelink transmission(s) for a data packet and/or a TB, wherein the oneor multiple sidelink transmission(s) are transmitted with the samesidelink transmit power. The resources of the one or multiple sidelinktransmission(s) may be indicated by one grant, from network node to thetransmitting device. Alternatively, the resources of the one or multiplesidelink transmission(s) may be selected by the transmitting device. Thesidelink transmit power of the one or multiple sidelink transmission(s)is determined or derived based on one specific DL pathloss value. Themotivation could be to align or keep the same sidelink transmit power atleast for delivering the same data packet and/or the same TB.

In one embodiment, the one specific DL pathloss value may be determinedwhen the transmitting device performs the first or initial sidelinktransmission among the one or multiple sidelink transmission(s). Thesidelink transmit power may be determined when the transmitting deviceperforms the first or initial sidelink transmission among the one ormultiple sidelink transmission(s).

In one embodiment, the one specific DL pathloss value may be determinedbefore the transmitting device performs the first or initial sidelinktransmission among the one or multiple sidelink transmission(s). Thesidelink transmit power may be determined before the transmitting deviceperforms the first or initial sidelink transmission among the one ormultiple sidelink transmission(s). In one embodiment, the sidelinktransmit power of the other sidelink transmission(s) among the one ormultiple sidelink transmission(s) could be set or determined as thesidelink transit power of the first or initial sidelink transmissionamong the one or multiple sidelink transmission(s).

Alternatively, the transmitting device may perform one or multiplesidelink transmission(s) for a data packet and/or a TB. The resources ofthe one or multiple sidelink transmission(s) may be indicated by onegrant, from network node to the transmitting device. Alternatively, theresources of the one or multiple sidelink transmission(s) may beselected by the transmitting device.

The transmitting device may determine or derive sidelink transmit powerseparately or respectively for the one or multiple sidelinktransmission(s). The transmitting device may also determine or derivesidelink transmit power separately or respectively for each of the oneor multiple sidelink transmission(s). Furthermore, the transmittingdevice may determine or derive the sidelink transmit power for each ofthe one or multiple sidelink transmission(s) in different timeoccasions. Thus, the sidelink transmit power for each of the one ormultiple sidelink transmission(s) may be different. Since the DLpathloss value and/or sidelink pathloss value may vary, the transmittingdevice may determine or derive one sidelink transmit power before thetransmitting device transmits one of the one or multiple sidelinktransmission(s).

Alternatively, the transmitting device may perform one or multiplesidelink transmission(s) for a data packet and/or a TB, wherein the oneor multiple sidelink transmission(s) are transmitted with the samesidelink transmit power. The resources of the one or multiple sidelinktransmission(s) may be indicated by one grant, from network node to thetransmitting device. Alternatively, the resources of the one or multiplesidelink transmission(s) may be selected by the transmitting device. Thetransmitting device may re-determine or re-derive sidelink transmitpower for some of the one or multiple sidelink transmission(s). Thetransmitting device may determine or derive a first sidelink transmitpower for the first or initial sidelink transmission among the one ormultiple sidelink transmission(s). The blind sidelink retransmission(s)corresponding to the first or initial sidelink transmission may be setor determined as the first sidelink transit power.

When the transmitting device receives a HARQ feedback, such as NACK orDTX, associated with the first/initial sidelink transmission and/orcorresponding blind sidelink retransmission(s), the transmitting devicemay re-determine/re-derive a second sidelink transmit power for aHARQ-based sidelink retransmission. The blind sidelink retransmission(s)corresponding to the HARQ-based sidelink retransmission may be set ordetermined as the second sidelink transit power.

In one embodiment, the transmitting device may determine or derive thefirst sidelink transmit power and the second sidelink transmit power indifferent time occasions. Thus, the first or initial sidelink transmitpower and the second sidelink transmit power may be different. Since theDL pathloss value and/or sidelink pathloss value may vary, thetransmitting device may determine or derive the first sidelink transmitpower before the transmitting device transmits the first or initialsidelink transmission, and/or the transmitting device may determine orderive the second sidelink transmit power before the transmitting devicetransmits the (first) HARQ-based sidelink retransmission.

Following the same mechanism, if the transmitting device receivesanother HARQ feedback, such as NACK or DTX, associated with theHARQ-based sidelink retransmission, first or initial sidelinktransmission and/or corresponding blind sidelink retransmission(s), thetransmitting device may re-determine or re-derive a third sidelinktransmit power for another HARQ-based sidelink retransmission. The blindsidelink retransmission(s) corresponding to the another HARQ-basedsidelink retransmission may be set or determined as the third sidelinktransit power, and so on.

For all above methods, alternatives, and embodiments:

There are many alternatives for deriving DL pathloss value fordetermining or deriving sidelink transmit power. As an example, FIG. 15lists a plurality of alternatives. Alternatives 1˜7 shown in FIG. 15 maybe similar as DL pathloss value derivation utilized for uplink powercontrol in Uu interface. Alternatives 8˜12 in FIG. 15 are newalternatives as introduced and described above in Methods A˜D.

FIG. 15 also lists an example about the applicability for different SLmodes. Note that the applicability may not be restricted as the exampleshown in FIG. 15.

-   -   In one embodiment, for a device configured with network        scheduling mode, such as NR mode 1, for sidelink transmission, a        part of the alternatives may be utilized for deriving DL        pathloss value for sidelink power control. For instance, any of        alternatives 3˜12 may be utilized for deriving DL pathloss value        for sidelink power control. The network node may trace the        position and mobility of mode 1 devices. The network node may        adjust network beams for mode 1 devices. Thus, most alternatives        may be applicable for mode 1 devices, even for alternatives 3        and 8 wherein the device requires to receive or monitor dedicate        downlink control transmission.    -   In one embodiment, for a device in RRC-connected mode and does        not configured with network scheduling mode for sidelink        transmission, such as the device is operated in device        self-determination mode, such as NR mode 2, for sidelink        transmission, a part of the alternatives may be utilized for        deriving DL pathloss value for sidelink power control. For        instance, any of alternatives 1, 4˜7, and 9˜12 may be utilized        for deriving DL pathloss value for sidelink power control. For        mode 2 devices, since sidelink resources are not scheduled by        network via sidelink grant, the network node may not need to        trace (timely and accurately) the position and mobility of mode        2 devices. Thus, the network node may not need to adjust network        beams for mode 2 devices. Thus, alternatives 3 and 8, with        required to receive or monitor dedicate downlink control        transmission, may not be applicable for mode 2 devices.    -   In one embodiment, for a device in RRC-idle mode and does not        configured with network scheduling mode for sidelink        transmission, such as the device is operated in device        self-determination mode, such as NR mode 2, for sidelink        transmission, a part of the alternatives may be utilized for        deriving DL pathloss value for sidelink power control. For        instance, any of alternatives 1, 9, and 11˜12 may be utilized        for deriving DL pathloss value for sidelink power control. For        RRC-idle mode device, the network node may not know the position        and mobility of the RRC-idle device, and the device may not        receive dedicate configuration from network. Thus, alternatives        3˜8 and 10 may not be applicable for RRC-idle device.    -   In one embodiment, for a device configured with a mixed mode        supporting network scheduling mode and/or device        self-determination mode, such as NR mode 1 and/or mode 2, for        sidelink transmission, a part of the alternatives may be        utilized for deriving DL pathloss value for sidelink power        control. For instance, any of alternatives 3˜12 may be utilized        for deriving DL pathloss value for sidelink power control. Since        the device can operate in mode 1, the network node may trace the        position and mobility of the mixed mode device. The network node        may adjust network beams for the mixed mode device. Thus, most        alternatives may be applicable for the mixed mode device, even        for alternatives 3 and 8 wherein the device requires to receive        or monitor dedicate downlink control transmission.

The applicable alternatives can be different for devices operated indifferent modes. In one embodiment, when a device operates in networkscheduling mode, the device may apply a first alternative for derivingDL pathloss value for sidelink power control; and when the deviceoperates in device self-determination mode, the device may apply asecond alternative for deriving DL pathloss value for sidelink powercontrol.

In one embodiment, when a device operates in network scheduling mode,the device may apply a first alternative for deriving DL pathloss valuefor sidelink power control; and when the device does not operate innetwork scheduling mode, the device may apply a second alternative forderiving DL pathloss value for sidelink power control.

In one embodiment, when a device operated in RRC-connected mode, thedevice may apply a first alternative for deriving DL pathloss value forsidelink power control; and when the device operated in RRC-idle mode,the device may apply a second alternative for deriving DL pathloss valuefor sidelink power control.

In one embodiment, for a device configured with a mixed mode, when adevice operates in network scheduling mode of the mixed mode, the devicemay apply a first alternative for deriving DL pathloss value forsidelink power control; and when the device operates in deviceself-determination mode of the mixed mode, the device may apply a secondalternative for deriving DL pathloss value for sidelink power control.

In one embodiment, for a device configured with a mixed mode, when adevice operates in network scheduling mode of the mixed mode, the devicemay apply a first alternative for deriving DL pathloss value forsidelink power control; and when the device operates in deviceself-determination mode of the mixed mode, the device may apply thefirst alternative for deriving DL pathloss value for sidelink powercontrol.

For the first alternative and the second alternative, any combinationfrom the plurality of alternatives may be possible embodiments.

In one embodiment, the SS-RSRP may mean RSRP measured among referencesignals corresponding to SS or PBCH block. The CSI-RSRP may mean RSRPmeasured from CSI-RS. The DMRS-RSRP may mean RSRP measured from DMRS. Atime occasion may mean a TTI. A TTI may mean any of subframe, slot,sub-slot, mini-slot, or a set of symbols.

In one embodiment, a sidelink slot may mean a slot (fully or partially)comprising symbols for sidelink. A sidelink slot may also mean atransmission time interval for a sidelink (data) transmission. Asidelink slot could contain all OFDM (Orthogonal Frequency DivisionMultiplexing) symbols available for sidelink transmission within a slot.A sidelink slot could also contain a consecutive OFDM symbols availablefor sidelink transmission within a slot.

In one embodiment, when the (transmitting) device operates in deviceself-determination mode, such as NR mode 2, the (transmitting) devicecould perform sensing and resource selection. The (transmitting) devicecould select the sidelink resource based on sensing result. When the(transmitting) device could operate or be configured with networkscheduling mode, such as NR mode 1, the (transmitting) device acquiressidelink resources based on a grant from network.

In one embodiment, the (transmitting) device could receive or measurethe DL RS and could perform the sidelink transmission in the samecarrier or cell. Furthermore, the (transmitting) device could receive ormeasure the DL RS, and could perform the sidelink transmission in thesame frequency band. The DL RS and the sidelink transmission could bereceived or transmitted in the same carrier or cell or in the samefrequency band.

In one embodiment, the (transmitting) device could receive or measurethe CSI-RS, and could perform the sidelink transmission in the samecarrier or cell. Furthermore, the (transmitting) device could receive ormeasure the CSI-RS, and could perform the sidelink transmission in thesame frequency band. The CSI-RS and the sidelink transmission could bereceived or transmitted in the same carrier or cell or in the samefrequency band.

In one embodiment, the (transmitting) device could receive or measurethe SS or PBCH block, and could perform the sidelink transmission in thesame carrier or cell. The (transmitting) device could receive or measurethe SS or PBCH block, and could perform the sidelink transmission in thesame frequency band. The SS or PBCH block and the sidelink transmissioncould be received or transmitted in the same carrier or cell or in thesame frequency band.

In one embodiment, the (transmitting) device could receive or measurethe DMRS and could perform the sidelink transmission in the same carrieror cell. Furthermore, the (transmitting) device could receive or measurethe DMRS, and could perform the sidelink transmission in the samefrequency band. The DMRS and the sidelink transmission could be receivedor transmitted in the same carrier or cell or in the same frequencyband.

In one embodiment, the DL pathloss could mean the power propagation lossbetween network node and the (transmitting) device. The SL pathlosscould mean the power propagation loss between device and device.

In one embodiment, the (transmitting) device could be configured to useDL pathloss for sidelink power control. The (transmitting) device couldalso be configured to use both DL pathloss and SL pathloss for sidelinkpower control. The minimum of the power values given by open-loop powercontrol based on DL pathloss and the open-loop power control based on SLpathloss could be taken for sidelink transmit power.

In one embodiment, the sidelink transmission may be device-to-devicetransmission. Preferably, the sidelink transmission may be V2Xtransmission. The sidelink transmission may be P2X transmission. Thesidelink transmission may be on PC5 interface.

In one embodiment, the PC5 interface or link may be wireless interfacefor communication between device and device, among devices, and/orbetween UEs. In addition, the PC5 interface or link may be wirelessinterface for V2X or P2X communication. The Uu interface or link may bewireless interface for communication between network node and device, orbetween network node and UE.

In one embodiment, the (transmitting) device may be a UE, a vehicle UE,or a V2X UE. The downlink control transmission may mean PDCCH. The grantmay mean a sidelink grant delivered or included in PDCCH. The grant mayalso mean a DCI format, for scheduling sidelink resources, delivered orincluded in PDCCH.

In one embodiment, the sidelink power control may be maintained persidelink link or connection. The sidelink power control may bemaintained per sidelink group.

In one embodiment, the sidelink transmission may mean PSSCH. Thesidelink transmit power may mean the transmit power of PSSCH.

In one embodiment, the sidelink transmission may mean PSCCH. Thesidelink transmit power may mean the transmit power of PSCCH.

In one embodiment, the sidelink transmission may mean PSFCH. Thesidelink transmit power may mean the transmit power of PSFCH.

In one embodiment, the PSSCH and PSCCH for the same sidelink link orconnection may share the same (alternative for deriving) DL pathloss forsidelink power control. The PSSCH and PSCCH transmitted for the samesidelink group may share the same (alternative for deriving) DL pathlossfor sidelink power control. The PSSCH, PSCCH, and PSFCH for the samesidelink link or connection may share the same (alternative forderiving) DL pathloss for sidelink power control. Furthermore, thePSSCH, PSCCH, and PSFCH transmitted for the same sidelink group mayshare the same (alternative for deriving) DL pathloss for sidelink powercontrol.

In one embodiment, the sidelink transmission may be a sidelink unicasttransmission, a sidelink groupcast transmission, or a sidelink broadcasttransmission.

In one embodiment, transmit power control for sidelink unicasttransmission may share the same DL pathloss value as transmit powercontrol for sidelink broadcast transmission. Transmit power control forsidelink groupcast transmission may also share the same DL pathlossvalue as transmit power control for sidelink broadcast transmission.Furthermore, transmit power control for sidelink groupcast transmissionmay share the same DL pathloss value as transmit power control forsidelink unicast transmission. In addition, transmit power control forsidelink unicast, groupcast, and broadcast transmission may share thesame DL pathloss value.

In one embodiment, transmit power control for sidelink unicasttransmission may use different DL pathloss values from transmit powercontrol for sidelink broadcast transmission. Transmit power control forsidelink groupcast transmission may also use different DL pathlossvalues from transmit power control for sidelink broadcast transmission.Furthermore, transmit power control for sidelink groupcast transmissionmay use different DL pathloss values from transmit power control forsidelink unicast transmission. In addition, transmit power control forsidelink unicast, groupcast, and broadcast transmission may usedifferent DL pathloss values.

In one embodiment, transmit power control for sidelink unicasttransmission may use the same alternative, for deriving DL pathlossvalue for sidelink, as transmit power control for sidelink broadcasttransmission. Furthermore, transmit power control for sidelink groupcasttransmission may use the same alternative, for deriving DL pathlossvalue for sidelink, as transmit power control for sidelink broadcasttransmission. In addition, transmit power control for sidelink groupcasttransmission may use the same alternative, for deriving DL pathlossvalue for sidelink, as transmit power control for sidelink unicasttransmission.

In one embodiment, transmit power control for sidelink unicast,groupcast, and broadcast transmission may use the same alternative forderiving DL pathloss value for sidelink. Furthermore, transmit powercontrol for sidelink unicast transmission may use differentalternatives, for deriving DL pathloss value for sidelink, from transmitpower control for sidelink broadcast transmission. In addition, transmitpower control for sidelink groupcast transmission may use differentalternatives, for deriving DL pathloss value for sidelink, from transmitpower control for sidelink broadcast transmission.

In one embodiment, transmit power control for sidelink groupcasttransmission may use different alternatives, for deriving DL pathlossvalue for sidelink, from transmit power control for sidelink unicasttransmission. Furthermore, transmit power control for sidelink unicast,groupcast, and broadcast transmission may use different alternatives forderiving DL pathloss value for sidelink.

In one embodiment, a (sidelink) resource pool may comprise resource(s)in a carrier or BWP. The carrier could be used for sidelink transmissionand NR Uu transmission. TTI could be a slot, subframe, mini-slot, orsub-slot (in a carrier or BWP).

FIG. 16 is a flow chart 1600 according to one exemplary embodiment fromthe perspective of a device to perform sidelink transmission. In step1605, the device is in RRC (Radio Resource Control)-connected mode in Uulink. In step 1610, the device is configured to use at least DL(Downlink) pathloss for sidelink power control. In step 1615, the devicederives or determines a sidelink transmit power. In step 1620, thedevice performs a sidelink transmission to other device(s) with thesidelink transmit power.

In one embodiment, the device could derive the sidelink transmit powerby one of following:

-   -   deriving a first DL pathloss value for determining an uplink        transmit power of one specific kind of uplink transmission, and        deriving or determining the sidelink transmit power based on the        first DL pathloss value; or    -   deriving one or multiple DL pathloss values based on one or        multiple SS/PBCH blocks, and selecting or deriving a specific DL        pathloss value based on the one or multiple DL pathloss values,        and determining or deriving the sidelink transmit power based on        the specific DL pathloss value.

In one embodiment, the device could derive the sidelink transmit powerby (1) deriving a first DL pathloss value for determining an uplinktransmit power of one specific kind of uplink transmission, and (2)deriving or determining the sidelink transmit power based on the firstDL pathloss value.

Furthermore, the device could derive a second DL pathloss value fordetermining an uplink transmit power of an uplink transmission, whereinthe uplink transmission is not the one specific kind of uplinktransmission; and the device could determine or derive the sidelinktransmit power without basing on or considering the second DL pathlossvalue. The one specific kind of uplink transmission may be PUSCHscheduled by DCI format 0_0. The DL pathloss value for determining orderiving sidelink transmit power may be associated or aligned to DLpathloss value for determining or deriving uplink transmit power of theone specific kind of uplink transmission. The DL pathloss value fordetermining or deriving sidelink transmit power could be derived basedon DL RS (Reference Signal) used for deriving DL pathloss value fordetermining or deriving uplink transmit power of the one specific kindof uplink transmission.

In addition, the device could derive a power value based on the first DLpathloss value, wherein the power value is an upper bound of thesidelink transmit power.

In one embodiment, the device could derive the sidelink transmit powerby (1) deriving one or multiple DL pathloss values based on one ormultiple SS (Synchronization Signal) or PBCH (Physical BroadcastChannel) blocks with different indexes, (2) selecting or deriving aspecific DL pathloss value based on the one or multiple pathloss values,and (3) determining or deriving the sidelink transmit power based on thespecific DL pathloss value. The specific DL pathloss value could be thesmallest DL pathloss value among the one or multiple pathloss values.The specific DL pathloss value could also be an average value derivedfrom the one or multiple DL pathloss values.

The device could derive the one or multiple DL pathloss values based onthe one or multiple SS or PBCH blocks that the device can obtain MIB(Master Information Block). The device could also derive each DLpathloss value respectively based on a SS or PBCH block with one SS orPBCH block index.

In addition, the device could derive a power value based on the specificDL pathloss value, wherein the power value is an upper bound of thesidelink transmit power.

Referring back to FIGS. 3 and 4, in one exemplary embodiment of a deviceto perform sidelink transmission. In one embodiment, the device isconfigured to use at least DL pathloss for sidelink power control.Furthermore, the device 300 is in RRC (Radio Resource Control)-connectedmode in Uu link. In addition, the device 300 includes a program code 312stored in the memory 310. The CPU 308 could execute program code 312 toenable the device (i) to derives or determines a sidelink transmitpower, and (ii) to performs a sidelink transmission to other device(s)with the sidelink transmit power. Furthermore, the CPU 308 can executethe program code 312 to perform all of the above-described actions andsteps or others described herein.

FIG. 17 is a flow chart 1700 according to one exemplary embodiment fromthe perspective of a device to perform sidelink transmission. In step1705, the device is in RRC-connected mode in Uu link. In step 1710, thedevice is configured to use at least DL pathloss for sidelink powercontrol. In step 1715, the device derives a first DL pathloss value fordetermining an uplink transmit power of one specific kind of uplinktransmission. In step 1720, the device determines or derives a sidelinktransmit power based on the first DL pathloss value. In step 1725, thedevice performs a sidelink transmission to other device(s) with thesidelink transmit power.

In one embodiment, the one specific kind of uplink transmission could bePUSCH scheduled by DCI format 0_0. The device could derive a second DLpathloss value for determining an uplink transmit power of an uplinktransmission, wherein the uplink transmission is not the one specifickind of uplink transmission; and the device could determine or derivethe sidelink transmit power without basing on or considering the secondDL pathloss value.

In one embodiment, DL pathloss value for determining or derivingsidelink transmit power may be associated or aligned to DL pathlossvalue for determining or deriving uplink transmit power of the onespecific kind of uplink transmission. DL pathloss value for determiningor deriving sidelink transmit power could be derived based on DL RS usedfor deriving DL pathloss value for determining or deriving uplinktransmit power of the one specific kind of uplink transmission.

In one embodiment, the device could derive a power value based on thefirst DL pathloss value, wherein the power value is an upper bound ofthe sidelink transmit power.

Referring back to FIGS. 3 and 4, in one exemplary embodiment of a deviceto perform sidelink transmission. In one embodiment, the device is inRRC-connected mode in Uu link. Furthermore, the device is configured touse at least DL pathloss for sidelink power control. In addition, thedevice 300 includes a program code 312 stored in the memory 310. The CPU308 could execute program code 312 to enable the device (i) to derive afirst DL pathloss value for determining an uplink transmit power of onespecific kind of uplink transmission, (ii) to determine or derive asidelink transmit power based on the first DL pathloss value, and (iii)to perform a sidelink transmission to other device(s) with the sidelinktransmit power. Furthermore, the CPU 308 can execute the program code312 to perform all of the above-described actions and steps or othersdescribed herein.

FIG. 18 is a flow chart 1800 according to one exemplary embodiment fromthe perspective of a device to perform sidelink transmission. In step1805, the device is in RRC-connected mode in Uu link. In step 1810, thedevice is configured to use at least DL pathloss for sidelink powercontrol. In step 1815, the device derives one or multiple DL pathlossvalues based on one or multiple SS or PBCH blocks with differentindexes. In step 1820, the device selects or derives a specific DLpathloss value based on the one or multiple pathloss values. In step1820, the device determines or derives a sidelink transmit power basedon the specific DL pathloss value. In step 1825, the device performs asidelink transmission with the sidelink transmit power.

In one embodiment, the specific DL pathloss value could be the smallestDL pathloss value among the one or multiple pathloss values, or thespecific DL pathloss value could be an average value derived from theone or multiple DL pathloss values.

In one embodiment, the device could derive the one or multiple DLpathloss values based on one or multiple SS or PBCH blocks that thedevice can obtain MIB. The device could derive each DL pathloss valuerespectively based on SS or PBCH block with one SS or PBCH block index.

In one embodiment, the device could derive a power value based on thespecific DL pathloss value, wherein the power value is an upper bound ofthe sidelink transmit power.

Referring back to FIGS. 3 and 4, in one exemplary embodiment of a deviceto perform sidelink transmission. In one embodiment, the device is inRRC-connected mode in Uu link. Furthermore, the device is inRRC-connected mode in Uu link. In addition, the device 300 includes aprogram code 312 stored in the memory 310. The CPU 308 could executeprogram code 312 to enable the device (i) to derives one or multiple DLpathloss values based on one or multiple SS or PBCH blocks withdifferent indexes, (ii) to select or derive a specific DL pathloss valuebased on the one or multiple pathloss values, (iii) to determine orderive a sidelink transmit power based on the specific DL pathlossvalue, and (iv) to perform a sidelink transmission with the sidelinktransmit power. Furthermore, the CPU 308 can execute the program code312 to perform all of the above-described actions and steps or othersdescribed herein.

Various aspects of the disclosure have been described above. It shouldbe apparent that the teachings herein may be embodied in a wide varietyof forms and that any specific structure, function, or both beingdisclosed herein is merely representative. Based on the teachings hereinone skilled in the art should appreciate that an aspect disclosed hereinmay be implemented independently of any other aspects and that two ormore of these aspects may be combined in various ways. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, such an apparatusmay be implemented or such a method may be practiced using otherstructure, functionality, or structure and functionality in addition toor other than one or more of the aspects set forth herein. As an exampleof some of the above concepts, in some aspects concurrent channels maybe established based on pulse repetition frequencies. In some aspectsconcurrent channels may be established based on pulse position oroffsets. In some aspects concurrent channels may be established based ontime hopping sequences. In some aspects concurrent channels may beestablished based on pulse repetition frequencies, pulse positions oroffsets, and time hopping sequences.

Those of skill in the art would understand that information and signalsmay be represented using any of a variety of different technologies andtechniques. For example, data, instructions, commands, information,signals, bits, symbols, and chips that may be referenced throughout theabove description may be represented by voltages, currents,electromagnetic waves, magnetic fields or particles, optical fields orparticles, or any combination thereof.

Those of skill would further appreciate that the various illustrativelogical blocks, modules, processors, means, circuits, and algorithmsteps described in connection with the aspects disclosed herein may beimplemented as electronic hardware (e.g., a digital implementation, ananalog implementation, or a combination of the two, which may bedesigned using source coding or some other technique), various forms ofprogram or design code incorporating instructions (which may be referredto herein, for convenience, as “software” or a “software module”), orcombinations of both. To clearly illustrate this interchangeability ofhardware and software, various illustrative components, blocks, modules,circuits, and steps have been described above generally in terms oftheir functionality. Whether such functionality is implemented ashardware or software depends upon the particular application and designconstraints imposed on the overall system. Skilled artisans mayimplement the described functionality in varying ways for eachparticular application, but such implementation decisions should not beinterpreted as causing a departure from the scope of the presentdisclosure.

In addition, the various illustrative logical blocks, modules, andcircuits described in connection with the aspects disclosed herein maybe implemented within or performed by an integrated circuit (“IC”), anaccess terminal, or an access point. The IC may comprise a generalpurpose processor, a digital signal processor (DSP), an applicationspecific integrated circuit (ASIC), a field programmable gate array(FPGA) or other programmable logic device, discrete gate or transistorlogic, discrete hardware components, electrical components, opticalcomponents, mechanical components, or any combination thereof designedto perform the functions described herein, and may execute codes orinstructions that reside within the IC, outside of the IC, or both. Ageneral purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

It is understood that any specific order or hierarchy of steps in anydisclosed process is an example of a sample approach. Based upon designpreferences, it is understood that the specific order or hierarchy ofsteps in the processes may be rearranged while remaining within thescope of the present disclosure. The accompanying method claims presentelements of the various steps in a sample order, and are not meant to belimited to the specific order or hierarchy presented.

The steps of a method or algorithm described in connection with theaspects disclosed herein may be embodied directly in hardware, in asoftware module executed by a processor, or in a combination of the two.A software module (e.g., including executable instructions and relateddata) and other data may reside in a data memory such as RAM memory,flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a harddisk, a removable disk, a CD-ROM, or any other form of computer-readablestorage medium known in the art. A sample storage medium may be coupledto a machine such as, for example, a computer/processor (which may bereferred to herein, for convenience, as a “processor”) such theprocessor can read information (e.g., code) from and write informationto the storage medium. A sample storage medium may be integral to theprocessor. The processor and the storage medium may reside in an ASIC.The ASIC may reside in user equipment. In the alternative, the processorand the storage medium may reside as discrete components in userequipment. Moreover, in some aspects any suitable computer-programproduct may comprise a computer-readable medium comprising codesrelating to one or more of the aspects of the disclosure. In someaspects a computer program product may comprise packaging materials.

While the invention has been described in connection with variousaspects, it will be understood that the invention is capable of furthermodifications. This application is intended to cover any variations,uses or adaptation of the invention following, in general, theprinciples of the invention, and including such departures from thepresent disclosure as come within the known and customary practicewithin the art to which the invention pertains.

The invention claimed is:
 1. A method of a device to perform sidelinktransmission, comprising: the device is in RRC (Radio ResourceControl)-connected mode in Uu link; the device is configured to use atleast DL (Downlink) pathloss for sidelink power control; the devicederives a first DL pathloss value for determining an uplink transmitpower of one specific kind of uplink data transmission scheduled by DCI(Downlink Control Information) format 0_0; the device determines orderives a sidelink transmit power based on the first DL pathloss value;and the device performs a sidelink transmission to other device(s) withthe sidelink transmit power.
 2. The method of claim 1, wherein thedevice derives a second DL pathloss value for determining an uplinktransmit power of an uplink data transmission, wherein the uplink datatransmission is not the one specific kind of uplink data transmission;and the device determines or derives the sidelink transmit power withoutbasing on or considering the second DL pathloss value.
 3. The method ofclaim 1, wherein DL pathloss value for determining or deriving sidelinktransmit power is associated or aligned to DL pathloss value fordetermining or deriving uplink transmit power of the one specific kindof uplink data transmission.
 4. The method of claim 1, wherein DLpathloss value for determining or deriving sidelink transmit power isderived based on DL RS (Reference Signal) used for deriving DL pathlossvalue for determining or deriving uplink transmit power of the onespecific kind of uplink data transmission.
 5. The method of claim 1,wherein the device derives a power value based on the first DL pathlossvalue, wherein the power value is an upper bound of the sidelinktransmit power.
 6. The method of claim 1, wherein the first DL pathlossvalue for deriving or determining the sidelink transmit power is notassociated with or not aligned to DL pathloss value for determininguplink transmit power of a non-specific kind of uplink data transmissionthat is different than the one specific kind of uplink datatransmission.
 7. The method of claim 6, wherein the non-specific kind ofuplink data transmission comprises PUSCH (Physical Uplink SharedChannel) scheduled by DCI (Downlink Control Information) format 0_1. 8.A method of a device to perform sidelink transmission, comprising: thedevice is in RRC (Radio Resource Control)-connected mode in Uu link; thedevice is configured to use at least DL (Downlink) pathloss for sidelinkpower control; the device derives one or multiple DL pathloss valuesbased on one or multiple SS (Synchronization Signal) or PBCH (PhysicalBroadcast Channel) blocks with different indexes; the device selects orderives a specific DL pathloss value based on the one or multiple DLpathloss values; the device determines or derives a sidelink transmitpower based on the specific DL pathloss value; and the device performs asidelink transmission with the sidelink transmit power.
 9. The method ofclaim 8, wherein the specific DL pathloss value is the smallest DLpathloss value among the one or multiple DL pathloss values, or thespecific DL pathloss value is an average value derived from the one ormultiple DL pathloss values.
 10. The method of claim 8, wherein thedevice derives the one or multiple DL pathloss values based on one ormultiple SS or PBCH blocks that the device obtains MIB (MasterInformation Block).
 11. The method of claim 8, wherein the devicederives each DL pathloss value respectively based on SS or PBCH blockwith one SS or PBCH block index.
 12. The method of claim 8, wherein thedevice derives a power value based on the specific DL pathloss value,wherein the power value is an upper bound of the sidelink transmitpower.
 13. The method of claim 1, wherein the device does not use DLpathloss value for determining uplink transmit power of a non-specifickind of uplink data transmission, comprising PUSCH scheduled by DCIformat 0_1, to derive the sidelink transmit power.